refs #6542 - ship freeipa script for creating users

(cherry picked from commit df7e3a609544ff10b1ff66e9c83f8c60bdd72be3)
refs #7028 - min apipie-rails for concerns fix

(cherry picked from commit 2dcaff382cd70a4af2b13d7b09bb43aff7d3acc9)
Release 1.6.0-RC2
Automatic commit of package [foreman] minor release [1.6.0-0.2.RC2].
Automatic commit of package [foreman-proxy] minor release [1.6.0-0.2.RC2].
Automatic commit of package [foreman-installer] minor release [1.6.0-0.2.RC2].
Automatic commit of package [foreman-selinux] minor release [1.6.0-0.2.RC2].