Handle overcloud-block-storage in heat template

Have tested with undercloud-live setup - scales compute
and block-storage (undercloud-live currently has ~6
node limit). All nodes go to running and heat reports a
"CREATE_COMPLETE". No post-create configuration here

Change-Id: Iaf85d1934d5e84295c1cedf6f360f3f4fb8adbb8
Merge "Handle overcloud-block-storage in heat template"