SGSN: Some initial SNS tests for IP-SNS in OsmoSGSN

Change-Id: I821d998704756fa30278f41d0371051db9d3fc58
diff --git a/pcu/osmo-pcu-sns.cfg b/pcu/osmo-pcu-sns.cfg
index a8a26bd..cfe4ccf 100644
--- a/pcu/osmo-pcu-sns.cfg
+++ b/pcu/osmo-pcu-sns.cfg
@@ -23,3 +23,5 @@
  gamma 0
  pcu-socket /tmp/pcu_bts
  gb-dialect ip-sns
+ns
+ timer tns-test 10