* 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 aruba_command module along with unit tests.
* Fixing PEP8 E303 too many blank lines.
* Adding default for timeout.
* Removing unused arguments. Moving default for timeout argument. Fixing cliconf to find hostname.
* Fixing PEP8 E302.