Factor configure_rhc out of install_rhc_pkg

For consistency with commit 48336e7e05ebf3d9d2d20d1975f4f005c9999928,
split configure_rhc out of install_rhc_pkg.
Merge pull request #56 from Miciah/openshift.ks-factor-configure_rhc-out-of-install_rhc_pkg

Factor configure_rhc out of install_rhc_pkg