* Fix vyos on network_cli on python3
bytes do not have format() in Python3
* Push connection to tasks, with bonus connection=local test
* Run tests without explicit connection set
* Add/update START messages where appropriate
* 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
* changed collection arg to argregate on 2.4 network modules
* replace users with aggregate in eos_user, junos_user, nxos_user
* added version_added to places where we replaced users with aggregate in the docs
* fix ios_static_route test
* update tests to reference aggregate instead of collection/users
