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

This reverts commit bca4e694f07ad76be5df639f52f345b0bb49d8ef.

Reason for revert: post submit broken

Change-Id: I8afc63b5aa67ee14127f79e2245ef543bff8cf31
18 files changed