[libvirt] Debian packaging for the Java bindings

[Wido den Hollander]

Currently the Java bindings for libvirt do not provide a Debian package.

Users with Debian based systems like Ubuntu are now forced to compile from source since
no binary distribution of the JAR file is available.

This patch adds building Debian packages with ant

$ ant deb

This will build a .deb file in the target directory.
It requires dpkg-dev to be installed.

Wido