Added virsh vm provider engine

Engine uses virsh to create vms from prebuilt template

blueprint vm-provider-virsh-single-host

Change-Id: If2ca7af7e4a44edb7891406abdcf69e314d7e60c
Added Devstack deploy engine

This is the first prototype of devstack deploy engine
Some configuration hardcode should be moved to config files

blueprint deploy-engine-devstack-simple

Change-Id: I750d8990a251a64a4362976a6ef65cace7cf3482
Merge "Added virsh vm provider engine"
Merge "Added Devstack deploy engine"