ServiceDirectory: Fix deadlock (since latest signal change).
ServiceDirectory: Fix deadlock (since latest signal change).

Change-Id: I8141de88efecb19b04217208a66efd906a22328a

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