CBQE:0 Sometimes replicators might take longer to sleep after previous operation so add some buffer time before loading any mutations

Change-Id: Ie2c6599d3257a9fe53ae63e7b49a04cbbbb4fea1
Reviewed-on: http://review.couchbase.org/39899
Tested-by: Aruna Piravi <aruna@couchbase.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Aruna Piravi <aruna@couchbase.com>