gbproxy: update sns configuration to use ip-sns-bind

With libosmocore commit the SNS configuration requires a ip-sns-bind vty configuration
to define the binds which should be use.

Related: SYS#5354
Depends-on: I9ab8092bf286e7d90e92f5702a5404425e959c84 (libosmocore)
Change-Id: If86fe463199bc5089db80a0dcc01f9e94e23e9b9

gbproxy/osmo-gbproxy.cfg

@@ -28,8 +28,10 @@ ns
   listen 127.0.0.1 23000
   accept-ipaccess
  nse 101
+  ip-sns-bind local
   ip-sns-remote 127.0.0.10 7777
  nse 102
+  ip-sns-bind local
   ip-sns-remote 127.0.0.11 8888
  timer tns-block 3
  timer tns-block-retries 3

gbproxy/osmo-gbproxy.fr.cfg

@@ -34,8 +34,10 @@ ns
  timer tns-alive 3
  timer tns-alive-retries 10
  nse 101
+  ip-sns-bind local
   ip-sns-remote 127.0.0.10 7777
  nse 102
+  ip-sns-bind local
   ip-sns-remote 127.0.0.11 8888
  nse 2001
   nsvc fr hdlcnet1 dlci 16 nsvci 1