Completes the power_state mapping from compute driver and manager

Fixes bug 1166906

Added extra states to constants module together with test
cases checking every state map.

Also added some debug statements under blockdev and operator
to be able to spot obvious issues with images at deploy time.

Change-Id: I77ebb4d417a3875b761f5fb220d9274b79611ff0
Merge "Completes the power_state mapping from compute driver and manager"