Delete routers that are requested but not reported as active

There are two cases that I can think of that result in a router being
requested but not reported as active.  One is that admin_state_up has
been set to False.  In this case, the router is never removed and
continues to be operational.

The other case is if a router is changed and then deleted before the
change is processed.  In this case, it is prudent to be sure that the
router is queued for deletion.

Change-Id: I4738f599a18f0d130cc8ad4d4dafc488eec75ffd
Closes-Bug: #1215387
Merge "Delete routers that are requested but not reported as active"