Allow to reinitialize the providers (FORWARDPORT)

Change-Id: I843baa192ea1da6a296984a199f83185f698787e
Reviewed-on: http://review.couchbase.org/36417
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>