[libvirt] [PATCH 1/2] Java bindings for domain events

The attached patch (against libvirt-java) implements Java bindings for libvirt domain events. This version provides a libvirt EventImpl running in its own Java Thread, and provides per-Connect synchronization that makes using the bindings thread-safe. (Note the Domain, Network, StoragePool, and StorageVol methods also synchronize on their Connect object, as required by libvirt. I have similar changes for NodeDevice.java that need to be made when that code is checked in.) This version of the patch also implements and uses an enum class (DomainEvent.Type), as suggested by Tóth István. IMPORTANT: THIS PATCH WILL BREAK THINGS UNLESS THE NEXT [PATCH 2/2] IS APPLIED TO libvirt FIRST. Also, libvirt must be compiled WITH_PTHREADS for Java events to work. Dave