Reject WBE messages if they can't be put in an ack state

Attempt to reject messages that could not be acknowledged
so that those messages could be resent (requeueing is not
appropriate since it will just cause the message to come
back).

Fixes bug 1364543

Change-Id: I2cb33b39be950528fa9e22d9a11722bedd0927aa
Merge "Reject WBE messages if they can't be put in an ack state"