Add systemd RuntimeDirectory & RuntimeDirectoryMode

Create the "%{_runstatedir}/munge" directory using the systemd unit
configuration options RuntimeDirectory and RuntimeDirectoryMode.
These options were added in systemd 211.  Back in commit d034b3a,
tmpfiles.d was used instead since CentOS 7 at the time was running
systemd 208; but, CentOS 7.6.1810 is running systemd 219.

The creation of the "tmpfiles.d/munge.conf" file is being kept for
now in case it is still needed somewhere, but this file is no longer
being installed.

The RPM %ghost tag in munge.spec is once again added back to the
"%{_runstatedir}/munge" directory since this directory is now created
by systemd when the munge service is started, and removed by systemd
when the munge service is stopped.

Reference:
- https://www.freedesktop.org/software/systemd/man/systemd.exec.html

Tested:
- CentOS 7.6.1810 (systemd 219)
- Fedora 29 (systemd 239)

Signed-off-by: Chris Dunlap <cdunlap@llnl.gov>

munge.spec

@@ -123,12 +123,11 @@ fi
 %attr(0600,munge,munge) %ghost %{_localstatedir}/lib/munge/munged.seed
 %dir %attr(0700,munge,munge) %{_localstatedir}/log/munge
 %attr(0640,munge,munge) %ghost %{_localstatedir}/log/munge/munged.log
-%dir %attr(0755,munge,munge) %{_runstatedir}/munge
+%dir %attr(0755,munge,munge) %ghost %{_runstatedir}/munge
 %attr(0644,munge,munge) %ghost %{_runstatedir}/munge/munged.pid
 %{_bindir}/*
 %{_sbindir}/*
 %{_mandir}/*[^3]/*
-%{_tmpfilesdir}/munge.conf
 %{_unitdir}/munge.service
 
 %files devel

src/etc/Makefile.am

@@ -59,7 +59,7 @@ noinst_DATA = \
 	$(SUBSTITUTE_FILES) \
 	# End of noinst_DATA
 
-install-data-hook: install-dirperms install-pkgconfig install-systemd install-sysvinit install-tmpfiles
+install-data-hook: install-dirperms install-pkgconfig install-systemd install-sysvinit
 
 install-dirperms:
 	$(MKDIR_P) -m 0700 "$(DESTDIR)$(sysconfdir)/munge"

src/etc/munge.service.in

@@ -8,6 +8,8 @@ After=time-sync.target
 Type=forking
 ExecStart=@sbindir@/munged
 PIDFile=@runstatedir@/munge/munged.pid
+RuntimeDirectory=munge
+RuntimeDirectoryMode=0755
 User=munge
 Group=munge
 Restart=on-abort