* 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
- authorize was not working as expected
- use end command to get to exec context instead of exit
- error due to mishandling of global variable _DEVICE_CONFIG
* Remove uses of assert in production code
* Fix assertion
* Add code smell test for assertions, currently limited to lib/ansible
* Fix assertion
* Add docs for no-assert
* Remove new assert from enos
* Fix assert in module_utils.connection
