Hadoop role: depend on JARs for GELF, pass param

* rework of https://gerrit.wikimedia.org/r/#/c/140677/
* logstash-gelf.jar is now packaged as liblogstash-gelf-java

Change-Id: I129ee2c00d174c4c190321040afc52c65da38581
Merge "Hadoop role: depend on JARs for GELF, pass param" into production