Deb for logstash-gelf.jar: liblogstash-gelf-java

Provides logging to Logstash using GELF via JUL, Log4j, etc.
* https://github.com/mp911de/logstash-gelf
* Uses git-buildpackage, pristine-tar, maven-repo-helper, quilt
* Satisfies dependencies using archiva.wikimedia.org
* Passes Lintian and Piuparts
* Resulting jar compares as expected to the version in Maven Central

Change-Id: I8ca2776f6644993c06793d6c0d0009bae37e48d7