Remove Foreman specific code - rails
Remove Foreman specific code - cli
Make installation of Foreman optional

This allows better flexibility of choosing whether installing the Foreman
with Katello on the same machine. It's installed only if
katello-configure-foreman is installed as a subpackage.
Remove Foreman specific code - system tests
Remove Foreman specific code - update scripts
Follow Fedora guidelines when obsoleting subpackage

http://fedoraproject.org/wiki/Packaging:Guidelines#Renaming.2FReplacing_Existing_Packages
Add katello-configure-foreman to comps and remove katello-glue-foreman
Merge pull request #1921 from iNecas/deforeman

Remove unused Foreman integration code