[java] Fix TestKuduPartitioner errorprone warning

This fixes the following errorprone warning:

Expression of type int may overflow before being assigned to a long
long upperBound = timeoutMs * 2; // Add 100% to avoid flakiness.

Change-Id: I9fd41b7cae9502468728efbdf51e3d7191447371
Reviewed-on: http://gerrit.cloudera.org:8080/14488
Tested-by: Kudu Jenkins
Reviewed-by: Adar Dembo <adar@cloudera.com>
1 file changed