dnc/config: use default server path in dnc.yaml

On installation, this file is installed in server folder, so using
the default path is more convenient. On client-side, this file is not
copied, it's created by dhtnet-crtmgr with the correct path.

Change-Id: I4be51909bed5b579369d5df818e0d01fe11ec3bb

tools/dnc/dnc.yaml

@@ -21,8 +21,8 @@ enable_upnp: true
 
 # On server, identities are saved in /etc/dhtnet/id/
 # On client, identities are saved in ~/.dnc/
-#certificate: "to/your/certificate.crt"
-#privateKey: "to/your/privatekey.pem"
+#certificate: "/etc/dhtnet/id/id-server.crt"
+#privateKey: "/etc/dhtnet/id/id-server.pem"
 
 
 ##########################