adding new server instance type for aws testing
adding new server instance type for aws testing

Change-Id: Ic9ed4ede4a426c065c08b43d6a648f62e8c67287
Reviewed-on: http://review.couchbase.org/96702
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: <7c5437523872fffef04ef9d4aaffcc0ca27fba16@gmail.com>

couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner