Fix for livemigration provision breakage.

Closes-Bug: #1389349
Issue: Live migration provisioning is broken.
Fix: 1. Corrected the setup arguments, which were pointing to wrong name
     2. Corrected the entry point for the compute-livemigration script.
     3. Enabled calling of the compute-livemigration script from
        storage/setup.py
Test: Verified the changes in QA setup.

Change-Id: Iaeeb970714e430154c73fbfe51478bb5d5fc6242