When enable password is configured in device, ML2 plugin
will not be able to configure the device via SSH or TELNET.
Now this is supported by reading the response of each command
and identifying the prompt.
Add ini files to repository and list ini files and entry
points in setup.cfg for MLX plugins.
Update requirements.txt, tox.ini files for Neutron repo
Add config registrations to mech driver as these were
removed when decomposed from Neutron. Update mech driver
to return in cases of unsupported type or physnet
instead of throwing exception.
Update requirements.txt to be same as current Neutron
Add devstack plugin shell script.