Update common role

[spartan782]

Each role needs to be checked and update any ansible modules or tasks that are deprecated, failing or giving warnings.

[koelslaw]

• TASK [common : Disable IPv6 for all interfaces] ****************************************************************
  [WARNING]: The value 1 (type int) in a string field was converted to u'1' (type string). If this does not look
  like what you expect, quote the entire value to ensure it does not change.
  changed: [simplerockbuild.simplerock.lan]

• TASK [common : Configure RockNSM online repos] *****************************************************************
  changed: [simplerockbuild.simplerock.lan] => (item={u'gpgcheck': True, u'name': u'rocknsm_2_5', u'baseurl': u'https://packagecloud.io/rocknsm/2_5/el/7/$basearch'})
  changed: [simplerockbuild.simplerock.lan] => (item={u'gpgcheck': False, u'name': u'rocknsm_2_5-source', u'baseurl': u'https://packagecloud.io/rocknsm/2_5/el/7/SRPMS'})
  [WARNING]: The value 750 (type int) in a string field was converted to u'750' (type string). If this does not
  look like what you expect, quote the entire value to ensure it does not change.
  [WARNING]: The value 300 (type int) in a string field was converted to u'300' (type string). If this does not
  look like what you expect, quote the entire value to ensure it does not change.

• TASK [common : Create RockNSM control script symlink] **********************************************************
  [WARNING]: Cannot set fs attributes on a non-existent symlink target. follow should be set to False to avoid
  this.
  changed: [simplerockbuild.simplerock.lan]

[koelslaw]

Offline Deploy:

• TASK [common : Download RockNSM elastic configs] *******************************************************************************[DEPRECATION WARNING]: evaluating u'rock_online_install' as a bare variable, this behaviour will go away and you might need to
  add |bool to the expression in the future. Also see CONDITIONAL_BARE_VARS configuration toggle. This feature will be removed in
  version 2.12. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg.

• TASK [common : Add the inventory into /etc/hosts] ******************************************************************************
  fatal: [simplerockbuild.simplerock.lan]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'address'\n\nThe error appears to be in '/usr/share/rock/roles/common/tasks/configure.yml': line 91, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Add the inventory into /etc/hosts\n ^ here\n"}