fix locking problem during timeout in VM GUI (2)

    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)