Add block completion signal

In I973d197245ed32612bde9209479e6ae3a443fc69, the signal_transport was
set to NO_SIGNAL to prevent the resource staying CREATE_IN_PROGRESS
forever. This means that Heat reports the stack is configured before it
actually is.

The correct fix was to add completion-signal to BlockStorageConfig.
However now there's a BlockStorage0AllNodesDeployment, we simply have to
receive the signal from allNodesConfig by setting the deployment
signal-transport.

Change-Id: I1f6408ca39fddd146e7aae140f61d265bbf563ec
Merge "Add block completion signal"