ns2: Allow setting the socket priority for a UDP bind

Change-Id: Ifdfa086ce1c8d62b256abb3454b70cf53da9dcdb
diff --git a/tests/gb/gprs_ns2_vty.vty b/tests/gb/gprs_ns2_vty.vty
index 78c7e78..891bde5 100644
--- a/tests/gb/gprs_ns2_vty.vty
+++ b/tests/gb/gprs_ns2_vty.vty
@@ -29,7 +29,7 @@
 OsmoNSdummy(config-ns-bind)# listen 127.0.0.14 42999
 OsmoNSdummy(config-ns-bind)# end
 OsmoNSdummy# show ns
-UDP bind: 127.0.0.14:42999 DSCP: 0
+UDP bind: 127.0.0.14:42999 DSCP: 0 Priority: 0
   IP-SNS signalling weight: 1 data weight: 1
   0 NS-VC:
 OsmoNSdummy# configure terminal
@@ -41,7 +41,7 @@
 NSEI 01234: UDP, DEAD
   1 NS-VC:
    NSVCI none: RECOVERING PERSIST data_weight=1 sig_weight=1 udp)[127.0.0.14]:42999<>[127.0.0.15]:9496
-UDP bind: 127.0.0.14:42999 DSCP: 0
+UDP bind: 127.0.0.14:42999 DSCP: 0 Priority: 0
   IP-SNS signalling weight: 1 data weight: 1
   1 NS-VC:
    NSVCI none: RECOVERING PERSIST data_weight=1 sig_weight=1 udp)[127.0.0.14]:42999<>[127.0.0.15]:9496
@@ -57,7 +57,7 @@
    NSVCI none: RECOVERING PERSIST data_weight=0 sig_weight=0 udp)[127.0.0.14]:42999<>[127.0.0.17]:9496
    NSVCI none: RECOVERING PERSIST data_weight=9 sig_weight=0 udp)[127.0.0.14]:42999<>[127.0.0.16]:9496
    NSVCI none: RECOVERING PERSIST data_weight=1 sig_weight=1 udp)[127.0.0.14]:42999<>[127.0.0.15]:9496
-UDP bind: 127.0.0.14:42999 DSCP: 0
+UDP bind: 127.0.0.14:42999 DSCP: 0 Priority: 0
   IP-SNS signalling weight: 1 data weight: 1
   3 NS-VC:
    NSVCI none: RECOVERING PERSIST data_weight=0 sig_weight=0 udp)[127.0.0.14]:42999<>[127.0.0.17]:9496