Updated URLs in README, and fix deps download issue on RedHat family

[dmurphy18]

What does this PR do?

Updated URLs for downloading the bootstrap script etc to GitHub repository

Also fixed issue with downloading dependencies on Redhat family by upgrading to latest version of pip. default pip (21.3.1) failed to utilize '.' arguments, would only work if specific requirements file was fed to it, upgrading to 24.3.1 resolved the issue.

Also added more systemd containers to test against.

What issues does this PR fix or reference?

fixes #2051

[ScriptAutomate]

Some changes.

Also: Doing a -h locally with the latest script, I get the following output. Wonder if this output should just be copy pasted into the current -h output in the README starting at line 84?

  Usage :  bootstrap-salt.sh [options] <install-type> [install-type-args]

  Installation types:
    - stable               Install latest stable release. This is the default
                           install type
    - stable [branch]      Install latest version on a branch. Only supported
                           for packages available at packages.broadcom.com
    - stable [version]     Install a specific version. Only supported for
                           packages available at packages.broadcom.com
                           To pin a 3xxx minor version, specify it as 3xxx.0
    - testing              RHEL-family specific: configure EPEL testing repo
    - git                  Install from the head of the master branch
    - git [ref]            Install from any git ref (such as a branch, tag, or
                           commit)
    - onedir               Install latest onedir release.
    - onedir [version]     Install a specific version. Only supported for
                           onedir packages available at packages.broadcom.com

    - onedir_rc            Install latest onedir RC release.
    - onedir_rc [version]  Install a specific version. Only supported for
                           onedir RC packages available at packages.broadcom.com

  Examples:
    - bootstrap-salt.sh
    - bootstrap-salt.sh stable
    - bootstrap-salt.sh stable 3006
    - bootstrap-salt.sh stable 3006.1
    - bootstrap-salt.sh testing
    - bootstrap-salt.sh git
    - bootstrap-salt.sh git 3006.7
    - bootstrap-salt.sh git v3006.8
    - bootstrap-salt.sh git 3007.1
    - bootstrap-salt.sh git v3007.1
    - bootstrap-salt.sh git 06f249901a2e2f1ed310d58ea3921a129f214358
    - bootstrap-salt.sh onedir
    - bootstrap-salt.sh onedir 3006
    - bootstrap-salt.sh onedir_rc
    - bootstrap-salt.sh onedir_rc 3008


  Options:
    -a  Pip install all Python pkg dependencies for Salt. Requires -V to install
        all pip pkgs into the virtualenv.
        (Only available for Ubuntu based distributions)
    -A  Pass the salt-master DNS name or IP. This will be stored under
        ${BS_SALT_ETC_DIR}/minion.d/99-master-address.conf
    -b  Assume that dependencies are already installed and software sources are
        set up. If git is selected, git tree is still checked out as dependency
        step.
    -c  Temporary configuration directory
    -C  Only run the configuration function. Implies -F (forced overwrite).
        To overwrite Master, Syndic or Api configs, -M,-S or -W, respectively, must
        also be specified. Salt installation will be ommitted, but some of the
        dependencies could be installed to write configuration with -j or -J.
    -d  Disables checking if Salt services are enabled to start on system boot.
        You can also do this by touching /tmp/disable_salt_checks on the target
        host. Default: ${BS_FALSE}
    -D  Show debug output
    -f  Force shallow cloning for git installations.
        This may result in an "n/a" in the version number.
    -F  Allow copied files to overwrite existing (config, init.d, etc)
    -g  Salt Git repository URL. Default: https://github.com/saltstack/salt.git
    -h  Display this message
    -H  Use the specified HTTP proxy for all download URLs (including https://).
        For example: http://myproxy.example.com:3128
    -i  Pass the salt-minion id. This will be stored under
        ${BS_SALT_ETC_DIR}/minion_id
    -I  If set, allow insecure connections while downloading any files. For
        example, pass '--no-check-certificate' to 'wget' or '--insecure' to
        'curl'. On Debian and Ubuntu, using this option with -U allows obtaining
        GnuPG archive keys insecurely if distro has changed release signatures.
    -j  Replace the Minion config file with data passed in as a JSON string. If
        a Minion config file is found, a reasonable effort will be made to save
        the file with a ".bak" extension. If used in conjunction with -C or -F,
        no ".bak" file will be created as either of those options will force
        a complete overwrite of the file.
    -J  Replace the Master config file with data passed in as a JSON string. If
        a Master config file is found, a reasonable effort will be made to save
        the file with a ".bak" extension. If used in conjunction with -C or -F,
        no ".bak" file will be created as either of those options will force
        a complete overwrite of the file.
    -k  Temporary directory holding the minion keys which will pre-seed
        the master.
    -K  If set, keep the temporary files in the temporary directories specified
        with -c and -k
    -l  Disable ssl checks. When passed, switches "https" calls to "http" where
        possible.
    -L  Also install salt-cloud and required python-libcloud package
    -M  Also install salt-master
    -n  No colours
    -N  Do not install salt-minion
    -p  Extra-package to install while installing Salt dependencies. One package
        per -p flag. You are responsible for providing the proper package name.
    -P  Allow pip based installations. On some distributions the required salt
        packages or its dependencies are not available as a package for that
        distribution. Using this flag allows the script to use pip as a last
        resort method. NOTE: This only works for functions which actually
        implement pip based installations.
    -q  Quiet salt installation from git (setup.py install -q)
    -Q  Quickstart, install the Salt master and the Salt minion.
        And automatically accept the minion key.
    -R  Specify a custom repository URL. Assumes the custom repository URL
        points to a repository that mirrors Salt packages located at
        packages.broadcom.com. The option passed with -R replaces the
        "packages.broadcom.com". If -R is passed, -r is also set. Currently only
        works on CentOS/RHEL and Debian based distributions and macOS.
    -s  Sleep time used when waiting for daemons to start, restart and when
        checking for the services running. Default: 3
    -S  Also install salt-syndic
    -r  Disable all repository configuration performed by this script. This
        option assumes all necessary repository configuration is already present
        on the system.
    -U  If set, fully upgrade the system prior to bootstrapping Salt
    -v  Display script version
    -V  Install Salt into virtualenv
        (only available for Ubuntu based distributions)
    -W  Also install salt-api
    -x  Changes the Python version used to install Salt (default: Python 3).
        Python 2.7 is no longer supported.
    -X  Do not start daemons after installation

[dmurphy18]

did the -h as you suggested
My vim editor got a little over anxious with long lines and cut them up, thanks for the catch