redhat: add systemd service files

 * redhat/*.service: add systemd service file for each routing daemon
 * redhat/quagga.sysconfig: add comment about watchquagga and systemd
 * redhat/Makefile.am: add systemd service files to distribution

Signed-off-by: David Ward <david.ward@ll.mit.edu>
Signed-off-by: David Lamparter <equinox@diac24.net>
diff --git a/redhat/quagga.sysconfig b/redhat/quagga.sysconfig
index 2befc0f..4d6ec5a 100644
--- a/redhat/quagga.sysconfig
+++ b/redhat/quagga.sysconfig
@@ -10,7 +10,12 @@
 RIPNGD_OPTS="-A ::1"
 ZEBRA_OPTS="-A 127.0.0.1"
 
-# Watchquagga configuration
+# Watchquagga configuration for LSB initscripts
+#
+# (Not needed with systemd: the service files are configured to automatically
+# restart any daemon on failure. If zebra fails, all running daemons will be
+# stopped; zebra will be started again; and then the previously running daemons
+# will be started again.)
 #
 # Uncomment and edit this line to reflect the daemons you are actually using:
 #WATCH_DAEMONS="zebra bgpd ospfd ospf6d ripd ripngd"