Passenger to work with restart.txt

Passenger standalone needs to be told the root instead of just cd
<root>; bundle exec passenger start, otherwise it'll watch the old file
from the original symlink target.

I suppose with this method Passenger still runs using the original
version defined in Gemfile.lock upon deployment, ie. if that's changed
the change does not happen by just touching restart.txt

Maybe run sudo restart qa-reports instead?