Fix "Duplicate definition found" error message
Fix "Duplicate definition found" error message

This should help diagnose IMPALA-2439 if we see this condition again.

Change-Id: I234319e788b5df9794edcdf5a81332dea7f2955b
Reviewed-on: http://gerrit.cloudera.org:8080/1631
Reviewed-by: Skye Wanderman-Milne <6d4b168ab637b0a20cc9dbf96abb2537f372f946@cloudera.com>
Tested-by: Internal Jenkins

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