CBQER-1082 add test spec for linux kv only test

Change-Id: Ia6a8d2a449b132ef5cd66af368b6463ee50d0ce7
Reviewed-on: http://review.couchbase.org/26395
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Chisheng Hong <chisheng@couchbase.com>