Make memory limit message in agg less confusing
Make memory limit message in agg less confusing

The memory limit can be hit because of either the query memory limit or
the process memory limit. The previous text implied that it was always
the query memory limit.

Change-Id: I15e29424df3a7cc832d1256431f2ad166f42444e
Reviewed-on: http://gerrit.cloudera.org:8080/2230
Reviewed-by: Dan Hecht <20ebd99959f0f6e5dcb0fc319b4d8ef53a16b5fb@cloudera.com>
Tested-by: Internal Jenkins

ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC,ibmsoe/ImpalaPPC