Description of problem:
When upgrading libselinux the system will complain about being unable to remount
/ readonly during the next reboot. There seems to be several packages that cause
this, libselinux is one of them. I tracked this down to init, which links
against libselinux and thus holds on to the deleted old version. Since init is
not killed during shutdown the old lib is never really freed, so / can not be
umounted cleanly.
Sending a "telinit U" during libselinux %post ought to take care of this.

Version-Release number of selected component (if applicable):
libselinux-1.27.7-1

How reproducible:
Always

Steps to Reproduce:
1. Reboot
2. Upgrade (or downgrade, does not matter) libselinux
3. Reboot
  
Actual results:
/ can not be remounted ro immediately before the reboot, causing a journal
replay on the next boot

Expected results:
Clean reboot

Additional info: