More testing of previous changes located two other problems that
this patch fixes.

First, if a connection reestablishment was attempted but the reconnect
failed initially (common if the server is simply unavailable, i.e.
recent Gmail outage) the reestablishment logic halts.  This patch
forces another attempt.

Second, the back-off delay that used to be present in the
conversation monitor (when it handled reestablishment) was missing
in the new code.  This adds it back.