Merged revisions r1577557 r1577565 r1577581 from tomcat/trunk:
Better reporting for skipped tests.
With org.junit.Assume the tests are clearly reported as 'skipped' in JUnit test run summary.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1577582 13f79535-47bb-0310-9956-ffa450edef68