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/babeld.service b/redhat/babeld.service
new file mode 100644
index 0000000..b1ea943
--- /dev/null
+++ b/redhat/babeld.service
@@ -0,0 +1,14 @@
+[Unit]
+Description=Babel routing daemon
+BindTo=zebra.service
+After=syslog.target network.target zebra.service
+ConditionPathExists=/etc/quagga/babeld.conf
+
+[Service]
+Type=forking
+EnvironmentFile=/etc/sysconfig/quagga
+ExecStart=/usr/sbin/babeld -d $BABELD_OPTS -f /etc/quagga/babeld.conf
+Restart=on-abort
+
+[Install]
+WantedBy=network.target