Terminate provider network polling on first call to success()

This call indicates we've received a new network configuration and
should stop polling.

Change-Id: I5a66f8ad5888a61966d0afb6ec0a090bbda6ebc7
Reviewed-on: http://review.couchbase.org/34969
Reviewed-by: Subhashni Balakrishnan <b.subhashni@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>