* 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 iosxr_netconf module to configure netcong service on Cisco
IOS-XR devices
* - Adds Integration test for module
- Handles diff return from load_config
* - Adds unit test for iosxr_netconf module