MB-9770: Recreate rest client for each new node

Change-Id: Iefab6f51866d16af2b3b3527cf1891d5cc71d5fe
Reviewed-on: http://review.couchbase.org/31252
Reviewed-by: Steve Yen <steve.yen@gmail.com>
Tested-by: Bin Cui <bin.cui@gmail.com>