Added launch_index to instance_ref in _copy_instance

This fixes an issue where cloud-init wouldn't run in
launched instances because there was no ami-launch-index
meta-data.

Change-Id: I690297eb4fe1cf57bae509019505448ceb16105c
Merge remote-tracking branch 'origin/stable/essex' into upmerge_index

Conflicts fixed, launch_multiple test fixed wrt Essex (quotas):
	nova/gridcentric/nova/api.py
	nova/gridcentric/tests/test_api.py
	nova/gridcentric/tests/utils.py

Change-Id: I4df32decc2354bd30472999e7ce453e9fb16c5cf