* 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
* Handle common agrument in aggregate parameter for vyos module
* Add supoort to set parameter in aggregate to it's respctive
top level argument if value not provided in aggregate.
* Aggregate argument spec validation
* Documentation for aggregate
* Fix unit test failure
* Add state intent argument in vyos interface
* State intent argument support
* Integration test for supported intent arguments
* Add intent testcase
* FIx ci issue
* Add default description string to vyos_interface
* If `state=up` it should remove the `disable` configuration
for interface. However, if no other interface parameter is configured
this ends up deleting the interface itself which is not the desired
behaviour. Hence adding a default description field to avoid such
scenario's.
* Minor changes
* Add default description to aggregate
* vyos implementation for net_interface module
* vyos_interface implementation module
* vyos_interface integration test
* net_interface integration test for vyos
* Change collection to aggregate