Update unit tests to use DBCP2

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1511905 13f79535-47bb-0310-9956-ffa450edef68
Switch from ignoring unavoidable generics warnings in Eclipse to
explicitly using @SuppressWarnings

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1511907 13f79535-47bb-0310-9956-ffa450edef68