contrib/systemd: add systemd-networkd examples from manuals

Change-Id: I265637f39dd16dd43992f33149e512e34ed83252
diff --git a/contrib/systemd/Makefile.am b/contrib/systemd/Makefile.am
index fbb553f..cbf0a97 100644
--- a/contrib/systemd/Makefile.am
+++ b/contrib/systemd/Makefile.am
@@ -1,4 +1,8 @@
-EXTRA_DIST = osmo-ggsn.service
+EXTRA_DIST = \
+	osmo-ggsn.service \
+	ggsn.network \
+	apn0.netdev \
+	$(NULL)
 
 if HAVE_SYSTEMD
 systemdsystemunit_DATA = \