fix locking problem during timeout in VM GUI

java.lang.IllegalMonitorStateException: attempt to unlock read lock, not
locked by current thread
attempt to unlock read lock, not locked by current thread
java.util.concurrent.locks.ReentrantReadWriteLock$Sync.unmatchedUnlockException(Unknown
Source)
java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryReleaseShared(Unknown
Source)
java.util.concurrent.locks.AbstractQueuedSynchronizer.releaseShared(Unknown
Source)
java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.unlock(Unknown
Source)
lcmc.gui.resources.VMSVirtualDomainInfo.start(VMSVirtualDomainInfo.java:2298)
lcmc.gui.resources.VMSVirtualDomainInfo$12$1.run(VMSVirtualDomainInfo.java:1781)
release 1.6.4