fixes 2232 - require custom create repo

due to gziping of groups.xml, rhel6 cannot be kickstarted from our trees
this adds a custom version of createrepo assembled by the pulp team
(cherry picked from commit bd77c0e9f8b364e1b5f83405b520b535dc7fb4a8)
Automatic commit of package [katello] release [1.3.27-1].