[GPRS] NS: VTY: Move all local ip/port bind values into 'ns' node

This removes the requirement for gb_proxy and sgsn to have duplicate
vty parsing code
diff --git a/openbsc/src/gprs/osmo_gbproxy.cfg b/openbsc/src/gprs/osmo_gbproxy.cfg
index 79f391f..d6b5619 100644
--- a/openbsc/src/gprs/osmo_gbproxy.cfg
+++ b/openbsc/src/gprs/osmo_gbproxy.cfg
@@ -6,11 +6,19 @@
  no login
 !
 gbproxy
- nsip bss local port 23000
- nsip sgsn nsei 101
+ sgsn nsei 101
 ns
  nse 101 nsvci 101
- nse 101 remote-ip 192.168.100.239
- nse 101 remote-port 7777
  nse 101 remote-role sgsn
  nse 101 encapsulation udp
+ nse 101 remote-ip 192.168.100.239
+ nse 101 remote-port 7777
+ timer tns-block 3
+ timer tns-block-retries 3
+ timer tns-reset 3
+ timer tns-reset-retries 3
+ timer tns-test 30
+ timer tns-alive 3
+ timer tns-alive-retries 10
+ encapsulation framerelay-gre enabled 1
+ encapsulation framerelay-gre local-ip 0.0.0.0