Install sample cfg file to /etc/osmocom

Change-Id: I2ac73f426d9489fcd64c2eea547eb1f3ec26ae2c
diff --git a/debian/osmo-hlr.install b/debian/osmo-hlr.install
index 5a7c37b..1b2cb56 100644
--- a/debian/osmo-hlr.install
+++ b/debian/osmo-hlr.install
@@ -1,3 +1,4 @@
+/etc/osmocom/osmo-hlr.cfg
 /lib/systemd/system/osmo-hlr.service
 /usr/bin/osmo-hlr
 /usr/bin/osmo-hlr-db-tool