Revert "Revert "Revert "Revert "Changing GridMigrationTask to use ModelDbController directly""""

This reverts commit 3772b246c2971d93f1b64755dd9249efe4828af1.

Reason for revert: Fixed the test failure

Change-Id: Ibdc9e184fcb32c7caa4ab25d8753a46fa322b703
18 files changed