CBQE-820 TempO error handling

Couple of tests cases were failing because of memcached error 134
error handling done whicle mutating keys

Change-Id: Ic3893c89bace4c0e209d46b77e418a957b44e1c6
Reviewed-on: http://review.couchbase.org/23808
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Deepkaran Salooja <deepkaran.salooja@globallogic.com>