NUTCH 1803 Put test dependencies in a separate lib dir

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1606715 13f79535-47bb-0310-9956-ffa450edef68
NUTCH-1802 Move TestbedProxy to test environment (jnioche)

git-svn-id: https://svn.apache.org/repos/asf/nutch/trunk@1606730 13f79535-47bb-0310-9956-ffa450edef68