Big simplifications

[kreczko]

This PR includes big simplifications for how the configuration is done.

• First of all, all default parameters have been moved to params.pp. All parameters attempt to read the hiera value first.

$enable_cgroup = hiera('enable_cgroup', false)

• Only init.pp contains the full list of parameters, other modules import them:

$managers = $htcondor::managers

• config.pp has been split across common.pp, worker.pp, manager.pp, scheduler.pp
• creation of the daemon list and calling condor_reconfig on configuration change has been simplified
• added a hiera example for how to set the parameters
• renamed computing element to scheduler

There is more coming, but the PR is very big already. I wanted to put this one out to see if everyone would be happy with such a change. The manifests should be easier to read and understand.

As with the past two PRs I will merge this one into the development branch.