ns: add test case TC_tx_blocked_foreign_nsvc

Check if a BLOCK PDU over a different/foreign connection is parsed.
* 2x initialize NSVC (RESET/UNBLOCK)
* TTCN  0-> NS: block (nsvci 1)
* TTCN  <-0 NS: block ack (nsvci 1)
* TTCN  1-> NS: unit data (nsvci 1)
* TTCN  <-1 NS: status (blocked)

Change-Id: I2b37a712bd70037b35b9deb8dab4a72d1e1d29fb
diff --git a/ns/NS_Tests.udp.cfg b/ns/NS_Tests.udp.cfg
index f040998..cdb071d 100644
--- a/ns/NS_Tests.udp.cfg
+++ b/ns/NS_Tests.udp.cfg
@@ -21,6 +21,18 @@
 				}
 			},
 			nsvci := 1234
+		},
+		{
+			provider := {
+				ip := {
+					address_family := AF_INET,
+					local_ip := "127.0.0.1",
+					local_udp_port := 22001,
+					remote_ip := "127.0.0.1",
+					remote_udp_port := 23001
+				}
+			},
+			nsvci := 1235
 		}
 	}
 }