CBQE-1282 after autofailover a node, restart it to make it ready for add back

Change-Id: Ie6e5ab2c352e5b5312830801798916d169db9ea3
Reviewed-on: http://review.couchbase.org/26732
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Tommie McAfee <tommie@couchbase.com>