Test to switch to xdcr with encryption after pause

Change-Id: I95ce44df329778207f083e49e6896ce93b2ed95c
Reviewed-on: http://review.couchbase.org/34961
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Reviewed-by: Aruna Piravi <aruna@couchbase.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>