Preload and never shutdown one instance and increase timeout

First access to Foreman instance can be slow, particularly when there are many
plugins installed (e.g. Katello). This patch preloads the first worker instance
at the very beginning when passenger is started, so there is almost no delay.

If you like it, I am happy to parametrize it. I would love to see this as a
default value.
> Not to be annoying, but I wonder if this should be done in params.pp
> instead of the template. Programming in templates is bad practice.

I totally agree with you, but in this case, I can't find any way how to
do that since there are two fragments rendered via apache::vhost. I am
not able to make the decision in the passenger class.

Therefore this ugly solution.

-- 
Later,

 Lukas "lzap" Zapletal
 irc: lzap #theforeman