ACCUMULO-1202 Add maven-failsafe-plugin execution to the build. No existing unit tests are converted at this time.

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1467503 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-1202 merge failsafe plugin execution to trunk; unit tests not converted at this time

git-svn-id: https://svn.apache.org/repos/asf/accumulo/trunk@1467508 13f79535-47bb-0310-9956-ffa450edef68