revert to the concat module from ripienaar

since the specified concat module rivieraal/concat doesn't seem to exist
revert to the one from ripienaar to satisfy all dependencys
Merge pull request #19 from mburger/master

revert to the concat module from ripienaar
Fix puppet-lint warnings in icinga::params
Merge pull request #20 from smarchive/puppet-lint

Fix puppet-lint warnings in icinga::params