MB-100: sanity test for read only

Change-Id: I81209c25a90df4ca453103a7799b73111a104819
Reviewed-on: http://review.couchbase.org/27198
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>
MB-100: added speed throttle to sanity test

Change-Id: I6ffdf01e6932c20af3daf1c52dab503b90261369
Reviewed-on: http://review.couchbase.org/27199
Reviewed-by: Ronnie Sun <ronnie@couchbase.com>
Tested-by: Ronnie Sun <ronnie@couchbase.com>