Do not close Server if already closing/closed
Do not close Server if already closing/closed

Change-Id: If6902cc8a3acabdcff5c652ba13485f6035a8538

vbarbaresi/libqi,aldebaran/libqi,aldebaran/libqi-java,aldebaran/libqi-java,bsautron/libqi,aldebaran/libqi,aldebaran/libqi,aldebaran/libqi-java