IMPALA-3491: Use unique_database fixture in test_data_errors.py.
IMPALA-3491: Use unique_database fixture in test_data_errors.py.

Testing: Ran the test locally 10 times in a loop on exhaustive.

Change-Id: I8337daf499b90819a253b883fedaa55bd6b6630e
Reviewed-on: http://gerrit.cloudera.org:8080/3087
Reviewed-by: Alex Behm <fe1626037acfc2dc542d2aa723a6d14f2464a20c@cloudera.com>
Tested-by: Internal Jenkins

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