Bug 1362: New AsyncWriteTransaction#submit method

- Added new AsyncWriteTransaction#submit and deprecated AsyncWriteTransaction#commit.

- Modified unit tests and current code (in the toaster) in the
  controller using commit.

Change-Id: I92317d01427bf442def8e7217ccb13313a0fd229
Signed-off-by: tpantelis <tpanteli@brocade.com>
Merge "Bug 1362: New AsyncWriteTransaction#submit method"