* 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
* Make access_token type str, remove alias, and make validate_certs default value true
* Remove comma
* Add bcf switch module
* Remove white space in blank line
* Fix yaml
* Try removing the RETURN just like in the other modules