*.spec.in: Use %config(noreplace) to retain current config file

Change-Id: I4e7f0a44d5e2d132b24ca0f38dc6f520b59112da
diff --git a/contrib/osmo-sgsn.spec.in b/contrib/osmo-sgsn.spec.in
index f9fe208..d6a8078 100644
--- a/contrib/osmo-sgsn.spec.in
+++ b/contrib/osmo-sgsn.spec.in
@@ -115,7 +115,7 @@
 %{_docdir}/%{name}/examples/osmo-sgsn/osmo-sgsn_custom-sccp.cfg
 %{_bindir}/osmo-sgsn
 %dir %{_sysconfdir}/osmocom
-%config %{_sysconfdir}/osmocom/osmo-sgsn.cfg
+%config(noreplace) %{_sysconfdir}/osmocom/osmo-sgsn.cfg
 %{_unitdir}/%{name}.service
 
 %files -n osmo-gtphub
@@ -125,7 +125,7 @@
 %{_docdir}/%{name}/examples/osmo-gtphub/osmo-gtphub.cfg
 %{_bindir}/osmo-gtphub
 %dir %{_sysconfdir}/osmocom
-%config %{_sysconfdir}/osmocom/osmo-gtphub.cfg
+%config(noreplace) %{_sysconfdir}/osmocom/osmo-gtphub.cfg
 %{_unitdir}/osmo-gtphub.service
 
 %files -n osmo-gbproxy
@@ -135,7 +135,7 @@
 %{_docdir}/%{name}/examples/osmo-gbproxy/osmo-gbproxy.cfg
 %{_bindir}/osmo-gbproxy
 %dir %{_sysconfdir}/osmocom
-%config %{_sysconfdir}/osmocom/osmo-gbproxy.cfg
+%config(noreplace) %{_sysconfdir}/osmocom/osmo-gbproxy.cfg
 %{_unitdir}/osmo-gbproxy.service
 
 %changelog