improve logging
gui: improve locking during mouse-over tests

java.lang.IllegalMonitorStateException
null
java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:155)
java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1260)
java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:460)
lcmc.gui.ClusterBrowser.ptestLockRelease(ClusterBrowser.java:2384)
lcmc.gui.resources.HostInfo$5.mouseOver(HostInfo.java:360)
lcmc.gui.resources.Info$11$1.run(Info.java:767)
java.lang.Thread.run(Thread.java:722)
gui: improve error handling during mouse over test