IMPALA-5986: Correct set-option logic to recognize digits in names.
IMPALA-5986: Correct set-option logic to recognize digits in names.

Arose during work for IMPALA-5376; prevents tests from passing consistently.

Change-Id: Ia3ba641553ff827dbd4673b9fe7ed7d9d5e83052
Reviewed-on: http://gerrit.cloudera.org:8080/8166
Reviewed-by: Michael Brown <97e4d5d0e400e5ad37382425ea95bde8b3933403@cloudera.com>
Tested-by: Impala Public Jenkins

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