logstash::params: use /usr as JAVA_HOME on redhat

This uses the java executable in /usr/bin/java which is always present
whichever version of jdk / jre happens to be installed. Maybe it would
apply to Debian as well.
Merge pull request #2 from ckaenzig/fix-redhat-javahome

logstash::params: use /usr as JAVA_HOME on redhat
removed camptocamp specific needs
use default java alternative path instead of JAVA_HOME
compress multiple resource declarations
change the way of specifying inputs, filters and outputs

 * use concat instead of template()
 * added parameters to set input/filter/output files
Merge pull request #3 from mbornoz/concat

Concat
committed by mistake
now, it's really possible to delete logstash::*instance(s)*
added basic LICENSE/README/MODULEFILE
Merge pull request #4 from mbornoz/improvements

Improvements
structure improvements + cosmetics

 * split resources in classes
 * use chaining feature to manage dependencies and relationships
switching this module to Apache license
Merge pull request #5 from mbornoz/refactoring

Refactoring
just explained in the README that we use fpm to build distrib packages
parameter $logstash::version has never been used
Merge pull request #6 from mbornoz/improvements

Improvements
logstash::intance: set config owner to logstash
Merge pull request #7 from ckaenzig/config-owner

logstash::intance: set config owner to logstash
logstash::initscript: simplification/standarization between Debian and Redhat