(#6854) Update Red Hat spec file
Sync the spec file with Fedora/EPEL and pull in the following changes:
- Ensure %%pre exits cleanly
- Fix License tag, puppet is now GPLv2 only
- Properly restart puppet agent/master daemons on upgrades from 0.25.x
- Require libselinux-utils when selinux support is enabled
- Support tmpfiles.d for Fedora >= 15 (#656677)