* adds support for using connection=netconf
This change updates the module to provide support for using
connection=netconf instead of connection=local. If connection=netconf
is used, then the various connection arguments will be silently ignored.
* adds netconf plugin default
This adds a default implementation for netconf plugins if the network_os
is not specified. The default plugin will implement only the standard
netconf rpcs
* fix up pep8 issues
b4fa68555d