tests: PCMK
fix race while removing a group
GUI: fix passing of component in mouse over callbacks

fixes also:
java.lang.NullPointerException
null
lcmc.utilities.Tools.setMenuOpaque(Tools.java:2217)
lcmc.gui.ResourceGraph.stopTestAnimation(ResourceGraph.java:363)
lcmc.gui.resources.ServiceInfo$14.mouseOut(ServiceInfo.java:2742)
lcmc.gui.resources.Info$10$2.run(Info.java:745)