* Refactor common network shared and platform specific code into package (part-1)
As per proposal #76 refactor common network shared and platform specific
code into sub-package.
https://github.com/ansible/proposals/issues/76
* ansible.module_utils.network.common - command shared functions
* ansible.module_utils.network.{{ platform }} - where platform is platform specific shared functions
* Fix review comments
* Fix review comments
* Adding ciscowlc_command module and unit tests.
* Adding __init__.py for unit test.
* Fixing PEP8 W503.
* Renaming module from ciscowlc_command to aire_command.
* Renaming aire_command to aireos_command.
