Add user 'ubuntu' to sudo group and set NOPASSWD:ALL during snaps-boot install

[rsku]

When running snaps-boot with -i switch, e.g.:
sudo -i python {git dir}/snaps-boot/iaas_launch.py -f {location of your configuration} -i

The Ansible script will fail with:
rku@intelbuild-two:~$ sudo -i python /home/rku/snaps-boot/iaas_launch.py -f /home/rku/hosts.yaml -i
INFO:iaas_launch:Launching Operation Starts ........
INFO:iaas_launch:Running as user root
INFO:iaas_launch:Reading configuration file [/home/rku/hosts.yaml]
INFO:file_utils:Loaded configuration
INFO:file_utils:Closing configuration file
INFO:iaas_launch:Rebar configuration {'password': 'r0cketsk8ts', 'user': 'rocketskates'}
INFO:pxe_utils:setIsolCpus function
INFO:pxe_utils:isolate cpu's for 10.30.9.11 are 4-17,22-35,40-54,57-71
INFO:pxe_utils:hugepagesz for 10.30.9.11 2MB
INFO:pxe_utils:hugepages for 10.30.9.11 24000
INFO:ansible_utils:Applying playbook [/home/rku/snaps-boot/snaps_boot/ansible_p/commission/setIsolCpus.yaml] with variables - {'isolcpus': '4-17,22-35,40-54,57-71', 'target': '10.30.9.11', hugepages': '24000', 'hugepagesz': '2MB'}
[WARNING]: No inventory was parsed, only implicit localhost is available

PLAY [10.30.9.11] ***************************************************************************************************************************************************************************

TASK [Gathering Facts] **********************************************************************************************************************************************************************
fatal: [10.30.9.11]: FAILED! => {"msg": "Privilege escalation method not found: None"}
to retry, use: --limit @/home/rku/snaps-boot/snaps_boot/ansible_p/commission/setIsolCpus.retry

PLAY RECAP **********************************************************************************************************************************************************************************
10.30.9.11 : ok=0 changed=0 unreachable=0 failed=1

Traceback (most recent call last):
File "/home/rku/snaps-boot/iaas_launch.py", line 219, in
__run(args)
File "/home/rku/snaps-boot/iaas_launch.py", line 104, in __run
pxe_utils.set_isol_cpus(config)
File "/home/rku/snaps-boot/snaps_boot/provision/pxe_utils.py", line 166, in set_isol_cpus
'hugepages': hugepages})
File "/usr/local/lib/python2.7/dist-packages/snaps_common/ansible_snaps/ansible_utils.py", line 143, in apply_playbook
playbook_path, ret_val, connection))
snaps_common.ansible_snaps.ansible_utils.AnsibleException: Error applying playbook [/home/rku/snaps-boot/snaps_boot/ansible_p/commission/setIsolCpus.yaml] with value [2] using the connectio type of [ssh]

This is fixed by three steps, (1) add ubuntu to sudo group, (2) add the line 'ubuntu ALL=(ALL) NOPASSWD:ALL' to visudo, and (3) add the line 'become_method: sudo' to snaps_boot/ansible_p/commission/setIsolCpus.yaml and snaps_boot/ansible_p/commission/delIsolCpus.yaml.

This issue requests that steps (1) and (2) be added to either the -p or the -s scripts. Step (3) will be fixed in a separate pr.