* WIP Pull persistent connection parameters via get_option
* Fix pep8
* Add use_persistent_connection setting to paramiko_ssh plugin
* Add vars section to persistent_command_timeout setting and prevail provider values over config manager
* Use persistent_command_timeout on network_cli instead of timeout
* Fix unit tests
If we don't call loader to get network_cli, then _load_name is never
set and we get KeyError.
* Pull persistent_command_timeout via config manager for ios connection local
* Pull persistent_command_timeout via config manager on connection local