IMPALA-1479: Downgrade severity of unknown query ID for report
IMPALA-1479: Downgrade severity of unknown query ID for report

The error message that was printed at INFO when a report is received for
an unknown query isn't really actionable, and can rapidly dominate a log
if there are many backends that are slow to tear down once a query is
finished. Any underlying problems with fragments continuing to run after
the query is finished should be detected through other means (e.g. the
debug webpage).

Change-Id: I156389f42a3fada1318020d4731c3da64793f7b1
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/5378
Reviewed-by: Nong Li <99a5e5f8f5911755b88e0b536d46aafa102bed41@cloudera.com>
Reviewed-by: Henry Robinson <3eca10f30041813f045165784e24b5a950a6cc7e@cloudera.com>
Tested-by: Henry Robinson <3eca10f30041813f045165784e24b5a950a6cc7e@cloudera.com>

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