CCBC-477: Be more careful with failing providers

- bc_cccp should cancel its timeout upon receipt of a successful config
- confmon should not switch to the next provider upon failure unless a
  refresh has been requested.

Change-Id: Ic29b68925e2ea2a6f0884f61834d38aa9ce102d9
Reviewed-on: http://review.couchbase.org/39392
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>