refs #7227 - configure Brightbox Ruby NG PPA for Ubuntu 12.04 (precise)
refs #7227 - install passenger-common1.9.1 on Ubuntu 12.04

Add passenger_ruby_package parameter to control additional package resource
for installing the Passenger libs for the version of Ruby that will be used
to run Foreman.  Begins to replace passenger_scl, which will be superseded by
this param and passenger_ruby.