gprs_ns2_sns: implement local change weight procedure

When changing the bind ip-sns weight, initiate a
SNS CHANGE WEIGHT procedure to inform the other side.

Related: OS#5036
Change-Id: Icec4dabb46bc198f68f91bfe09ba279fbe68d454
diff --git a/tests/gb/gprs_ns2_vty.vty b/tests/gb/gprs_ns2_vty.vty
index 45c8a16..62fff66 100644
--- a/tests/gb/gprs_ns2_vty.vty
+++ b/tests/gb/gprs_ns2_vty.vty
@@ -17,7 +17,7 @@
 OsmoNSdummy(config)# ns
 OsmoNSdummy(config-ns)# list
 ...
-  timer (tns-block|tns-block-retries|tns-reset|tns-reset-retries|tns-test|tns-alive|tns-alive-retries|tsns-prov|tsns-size-retries|tsns-config-retries) <0-65535>
+  timer (tns-block|tns-block-retries|tns-reset|tns-reset-retries|tns-test|tns-alive|tns-alive-retries|tsns-prov|tsns-size-retries|tsns-config-retries|tsns-procedures-retries) <0-65535>
   nse <0-65535> [ip-sns-role-sgsn]
   no nse <0-65535>
   bind (fr|udp) ID