Neutron VPNaaS: Use generated configuration files if available

Generate the Neutron VPNaaS sample config files by using the oslo
generator. The files are generated with a .sample extension and
replace the static example configuration files.

Once the generation code is delivered, the static config files
will be removed.

Change-Id: Icef8f7e8f0e8e78bfffa7a5af3f9f2300376b115
Related-blueprint: autogen-neutron-conf-file
Partial-bug: #1199963
Depends-On: I4a6094b8218dfd320d05bfb1e3bc121e8930c551
diff --git a/lib/neutron_plugins/services/vpn b/lib/neutron_plugins/services/vpn
index 8a379f5..e790913 100644
--- a/lib/neutron_plugins/services/vpn
+++ b/lib/neutron_plugins/services/vpn
@@ -29,7 +29,9 @@
 }
 
 function neutron_vpn_configure_agent {
-    cp $NEUTRON_VPNAAS_DIR/etc/vpn_agent.ini $Q_VPN_CONF_FILE
+    # Uses oslo config generator to generate LBaaS sample configuration files
+    (cd $NEUTRON_VPNAAS_DIR && exec ./tools/generate_config_file_samples.sh)
+    cp $NEUTRON_VPNAAS_DIR/etc/vpn_agent.ini.sample $Q_VPN_CONF_FILE
     if [[ "$IPSEC_PACKAGE" == "strongswan" ]]; then
         iniset_multiline $Q_VPN_CONF_FILE vpnagent vpn_device_driver neutron_vpnaas.services.vpn.device_drivers.strongswan_ipsec.StrongSwanDriver
         if is_fedora; then