DERBY-6294 On z/os on some machines:testAttributeDrdaHost(org.apache.derbyTesting.functionTests.tests.management.NetworkServerMBeanTest)junit.framework.AssertionFailedError 

Improve message when failure occurs. This does not fix the issue.



git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.10@1507392 13f79535-47bb-0310-9956-ffa450edef68