gbproxy: osmo-gbproxy.cfg: support new sgsn syntax

osmo-gbproxy has a new syntax for sgsns to support pooling

Change-Id: I157dbbe42db4ed03861b914e91e49764b0b1a1bb
diff --git a/gbproxy/osmo-gbproxy.fr.cfg b/gbproxy/osmo-gbproxy.fr.cfg
index b3d19d0..bd94c5b 100644
--- a/gbproxy/osmo-gbproxy.fr.cfg
+++ b/gbproxy/osmo-gbproxy.fr.cfg
@@ -47,4 +47,4 @@
   nsvc fr hdlcnet7 dlci 22 nsvci 7
   nsvc fr hdlcnet8 dlci 23 nsvci 8
 gbproxy
- sgsn nsei 101
+sgsn nsei 101