CBQE-1374 negative test for cbcollect info

Test cbcollect info when memcached and beam process are killed
Change-Id: I7bbd791280fb213dbdbc1c397e51c604384c7e15
Reviewed-on: http://review.couchbase.org/27872
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Chisheng Hong <chisheng@couchbase.com>