Ovpn user call and mgmt fixes + added new flag for init users db

[matveyI]

Hello everyone!

I suggest several fixes:

1. Added formatting for defining api endpoints + changed the order of importing libraries;
2. Fixed typos in the --db.path key when calling the openvpn-user command;
3. Added a new parameter authDataBaseInit for initializing the openvpn user database;
4. Added the DB initialization function (item 3) and its call when initializing the ovpn-admin server if the auth.db-init flag is true;
5. Changed the "status" command to "status 1" for the mgmt interface of the openvpn server for correct parsing of the status of active clients and routes in alpine and ubuntu / debian. In ubuntu, the output of "status" was different from the output in alpine. However, "status 1" solves the problem;
6. Added the "openvpn-user db-migrate" command for database migration in the "configure.sh" script. Its absence may lead to errors when adding a new user, since the users table lacked certain columns described in the INSERT sql query.

I'll note 3 and 4 separately. I believe that the "auth.db-init" flag is necessary, since using configure.sh is not always possible (for example, there is no script in the package, only a binary, or easy-rsa / firewall / openvpn server have already been configured differently).