livefs doesn't run %post

[dustymabe]

rpm-ostree-2017.8-2.fc28.x86_64

If I install an rpm that modifies users/groups and then livefs it, then I end up with a system that doesn't have those users/groups until I reboot the system.

on Rawhide.20170824.n.0 install and livefs httpd:

[root@vanilla-f26atomic ~]# rpm-ostree install httpd
...
[root@vanilla-f26atomic ~]# rpm-ostree ex livefs 
Diff Analysis: f172a6b1bed04219a3e341f6d0d0acf63ef1c9cd885ba1937bae6c4fd3f5aa1e => 9f601752e5757a04a2374
95a28ff3e70d78bb1a40621cc8ca1e66570a250c22f
Files: modified: 5 removed: 0 added: 612
Packages: modified: 0 removed: 0 added: 8
* Configuration changed in /etc
Preparing new rollback matching currently booted deployment
Copying /etc changes: 25 modified, 5 removed, 64 added
Transaction complete; bootconfig swap: yes deployment count change: 1
Overlaying /usr... done
Copying new config files... 5
[root@vanilla-f26atomic ~]# getent group | grep apache
[root@vanilla-f26atomic ~]# getent passwd  | grep apache
[root@vanilla-f26atomic ~]# systemctl start httpd
Job for httpd.service failed because the control process exited with error code.
See "systemctl  status httpd.service" and "journalctl  -xe" for details.
[root@vanilla-f26atomic ~]# journalctl -o cat -u httpd
Starting The Apache HTTP Server...
AH00543: httpd: bad user name apache
httpd.service: Main process exited, code=exited, status=1/FAILURE
Failed to start The Apache HTTP Server.
httpd.service: Unit entered failed state.
httpd.service: Failed with result 'exit-code'.

after reboot the user/group exists.

[cgwalters]

We'll have to cross the "live scripts" issue for cases like live replacement, but this one is actually because we only add files except for the rpmdb, but that excludes /usr/lib/passwd. We'd have to special case that too, or doing #49 would bring it back into the script bucket.

[cgwalters]

PR in #996