Update params.pp by adding new rabbitmq variable to set gpg key



See merge request !28

added rabbit_package_gpg_key parameter, which permit to specify gpg key source. …

…Default changed in https://www.rabbitmq.com/rabbitmq-release-signing-key.asc

See merge request !27

added rabbit_package_gpg_key parameter, which permit to specify gpg key source. Default changed in https://www.rabbitmq.com/rabbitmq-release-signing-key.asc

moved xinetd dependency in percona module in order to permit the correct percona class deployment (before users, tables and grant configuration)