Install systemd services with autotools

Change-Id: I7e4dae6b8c1685e8a673c58a843c41fa0af1b35c
diff --git a/contrib/Makefile.am b/contrib/Makefile.am
index db6d0f5..ab410c7 100644
--- a/contrib/Makefile.am
+++ b/contrib/Makefile.am
@@ -1 +1,3 @@
+SUBDIRS = systemd
+
 EXTRA_DIST = ipa.py