bconf_provider: Skip all SASL commands on relocation

Change-Id: Id9ed94103945400314acbd33d1100ef8fb3a49c9
Reviewed-on: http://review.couchbase.org/29683
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>