Allow to start/stop multiple servers
Allow to start/stop multiple servers

This change allows to pass multiple server names/ids to nova
start/stop.

Change-Id: Ide577a1016de3d09f31c1f6e7b61079380d99060

takeshineshiro/python-novaclient,guptaankita/python-novaclient,mat128/python-novaclient,CCI-MOC/python-novaclient,guptaankita/python-novaclient,CCI-MOC/python-novaclient,mat128/python-novaclient,takeshineshiro/python-novaclient