* 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
* adds new filter plugins for network use cases
* adds parse_cli filter
* adds parse_cli_textfsm filter
* adds Template class to network_common
* adds conditional function to network_common
* fix up PEP8 issues
* adds new common functions for declarative intent modules
* adds Entity and EntityCollection
* adds dict_diff and dict_combine
* update for CI PEP8 compliance
* more CI PEP8 fixes
* more PEP8 CI clean up
* refactors the lambda assignments into top level classes
this is to be in compliant the PEP8 CI sanity checks
* one last pep8 ci fix
