Disable metric verification for mem-pool.total-bytes.

This is to unblock the builds until IMPALA-1057 is resolved.

Change-Id: I3d2c861737526c33cf48b444c81c429b9abbe829
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3185
Reviewed-by: Lenni Kuff <lskuff@cloudera.com>
Reviewed-by: Ishaan Joshi <ishaan@cloudera.com>
Tested-by: Ishaan Joshi <ishaan@cloudera.com>
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3186