CDH-14907: Ignore Llama AM notifications whose AM handle does not match Impalas.
CDH-14907: Ignore Llama AM notifications whose AM handle does not match Impalas.

Change-Id: If73e4b6de6c222eb332b7e46fb3f692ef6da3074

michaelhkw/incubator-impala,cloudera/Impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,michaelhkw/incubator-impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala