remove readahead ordering hacks

The dependency cycle this introduced can cause systemd to get stuck
under some circumstances.

We will just disable systemd-readahead in the kickstart instead, because
getting this ordering hack to work properly in all cases is just not
feasible.

Bug: 1147807
Change-Id: I517c331c203981460e8440ac14c8b279c9f9c5b1
build selinux policy on RHEL7 also

Bug: 1149988
Change-Id: Iaa76acd282cd38db1f3dca6c4c4c5d3223e7dd0d
Merge branch 'master' into develop
Automatic commit of package [beah] release [0.7.8-1].