Configure Passenger in separate .conf file on Debian so PassengerRoot isn't lost

The changes in 005bf615c are also necessary for Ubuntu 14.04 which now
ships Passenger 4.x
Merge pull request #711 from GregSutcliffe/master

 Configure Passenger in separate .conf file on Debian so PassengerRoot isn't lost
Add a nodeset for Ubuntu 14.04.
Merge pull request #719 from mhaskel/ubuntu-testing

Add a nodeset for Ubuntu 14.04.
'be_mode' was getting confused by the leading 0.
Merge pull request #720 from mhaskel/vhost_mode_fix

'be_mode' was getting confused by the leading 0.