New sudocmd management module.

There is a new sudocmd management module placed in the plugins folder:

  plugins/modules/ipasudocmd.py

The sudocmd module allows to add or remove sudo commands.

The sudocmd module is as compatible as possible to the Ansible upstream
ipa_sudocmd module.

Here is the documentation for the module:

  README-sudocmd.md

New example playbooks have been added:

  playbooks/sudocmd/ensure-sudocmd-is-absent.yml
  playbooks/sudocmd/ensure-sudocmd-is-present.yml

Signed-off-by: Rafael Guterres Jeffman <rjeffman@redhat.com>