cherry pick: Fix potential looping issue

* If there is a change sent and no response from the server, we
  won't clean up the updates/deletes table
* In this case, we'll sync every ten seconds or so (at least
  until a new message comes in)
* This has been around for a very long time

fixes b/7232954 Exchange looping issue
Change-Id: I3569d2fb7262f06df44ca0ab0c3b85aa13527062
1 file changed