IMPALA-6381: increase test_exchange_delays timeout for isilon
IMPALA-6381: increase test_exchange_delays timeout for isilon

Change-Id: Ie82030403fa238b673b0a3ccdc7731b0d78b63af
Reviewed-on: http://gerrit.cloudera.org:8080/8993
Reviewed-by: Alex Behm <fe1626037acfc2dc542d2aa723a6d14f2464a20c@cloudera.com>
Tested-by: Impala Public Jenkins

cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala