remove rubygems for ruby18, add -doc and -debuginfo packages
add ruby193-libselinux-ruby package

this is dependency of ruby193-puppet from now, when puppet is build with selinux support
Merge remote-tracking branch 'origin/master' into pull-req-ruby193-libselinux-ruby2

Conflicts:
	rel-eng/comps/comps-katello-server-rhel6.xml
Merge pull request #2359 from xsuchy/pull-req-ruby193-libselinux-ruby2

reality check of comps for el6 and add new deps ruby193-libselinux