* 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 a cli transport option for the bigip_command module.
* Fixing keyerror when using other f5 modules. Adding version_added for new option in bigip_command.
* Removing local connection check because the F5 tasks can be delegated to any host that has the libraries for REST.
* Using the network_common load_provider.
* Adding unit test to cover cli transport and updating previous unit test to ensure cli was not called.
Ganesh Nalawade
Tim Rupp
James Mighion
Toshio Kuratomi