get rid of real_ prefix

serioulsy, how in the /FUCK/ did I come up with this, and why did I ever
thought that's a reasonable idea?
plugin.config: fix name of lenses & path of config file

It's plugin.config and plugin.lns -- not plugins.config or plugins.lns
That was hard to find.
Also, remove one more instance of real_ here.
follow plugin.config's example: indent erb

this makes the erb slightly more readable.
remove silly defaults from trafficserver::params

{} is a silly default, ax it.
let puppet guess service by itself

* this makes it more platform independant.
(also, the latest version of my package adds a symlink between
/etc/init/trafficserver.conf and /lib/init/upstart-job ;)