EL5/6 do not need to install firewalld files
BZ# 1315810 - postgresql plugin default configuration (contrib)
BZ# 1315990 - Please remove unnecessary requirements for munin-node
BZ# 1315951 - move /etc/tmpfiles.d/munin.conf to /usr/lib/tmpfiles.d
Remove firewalld Require and associated script. EPEL7 does not have them.
BZ# 1300379 - Please include firewalld service file for munin-node in RPM package
BZ# 1262751 - munin-common should be requires(pre) shadow-utils package
Brought forward munin-2.0.26-406c67e