Add Wait Condition to Block Storage Templates

In some environments the heat stack-create command would complete
even though the block storage node would still be in a
build/spawning state.  This patch adds a wait condition to ensure
the block storage node has a chance to complete and the stack-create
command to complete properly.

Change-Id: Idb524625b8d6df1ff6f927c22b72bc6d3d611686
Partial-Bug: #1290764