TasksTestCase.java: Extracted method waitTaskCompletedSuccessfully() from test classes. *.java: Called waitTaskCompletedSuccessfully() instead of getDoneTask().

OPENDJ-1725: Persistit: very long recovery and many discarded txns after addrate test

OPENDJ-1855: Reformat and cleanup pluggable backend code: adjust visibility, findbugs, ucdetector, etc... Performed first pass in order to facilitate future refactoring: * remove some unused classes/methods. There are some remaining unused methods but these look like they are going to be needed for the migration of the JE import * reduced visibility of many classes, methods, and fields * added final to some methods and fields * fixed some minor Java/Javadoc warnings.

OPENDJ-1777 Move test source directory to src/test/java Move all test code from tests/unit-tests-testng/src/server directory to maven standard test source directory src/test/java Update pom.xml accordingly