Remove source files of the User Interface

Jochen Raymaekers

24.48.2013 da28f7e2913554eb3fdedd31e6b0ae1128d56a87

opendj-sdk/opendj3/opendj-virtual/src/test/java/org/forgerock/opendj/virtual/GUI.java does not exist in tree 1ae7a89031608b43ef53359647d7011f6ae94129