* updates eos modules to use persistent connection socket
* removes split eos shared module and combines into one
* adds singular eos doc frag (eos_local to be removed after module updates)
* updates unit test cases
For devices that do not support mutliplexing, we cannot automatically
determine the network os. This removes the os guess static method
from the terminal plugin. For this devices, the network_os
value must be configured
This updates the network_cli connection plugin to attempt to automatically
determine the remote device os. The device network os discovery can
be overridden by setting the ansible_network_os value.
* adds new connection plugin `network_cli` which builds on paramiko
* adds new plugin `terminal` used for manipulating network_cli terminals
* adds new field to play_context `network_os` settable as ansible_network_os
This commit adds the plugins necesary to establish a persistent cli connection
to network devices of ssh. It builds on the paramiko connection plugin
to create a shell environment that will persistent through ansible-connection.
The `newtork_cli` plugin then uses the network_os in the instance of
PlayContext to load the appropriate network OS environment plugin for
handling opening and closing of shells as well as privilege escalation.
