Similar to bug 1138533, but slightly different...

Guest recipes and recipes dispatched to OpenStack do not obey OS major install options configured by the admin.

This is not actually a new problem in 0.18 (probably guest recipes regressed in 0.10) but it was never noticed before because OS major install options were not used for anything besides the "serial" Anaconda option which was added and then dropped during the RHEL7 Alpha timeframe. Now in 0.18 we have the distro feature variables which can be overridden for custom distros.

Steps to Reproduce:
1. Add a fake custom RHEL6 distro, as per the second half of https://bugzilla.redhat.com/show_bug.cgi?id=1070597#c11
2. Provision the custom RHEL6 distro in a guest recipe

Actual results:
After fixing bug 1138533, the distro is treated like RHEL7. Guest recipe kickstart includes systemd-specific bits (systemctl instead of chkconfig, RHTS_OPTION_COMPATIBLE=, etc).

Expected results:
Distro should be treated like RHEL6. Systemd-specific bits should not be present (chkconfig not systemctl, no RHTS_OPTION_COMPATIBLE=).