Update wrong references to bsc in sgsn code

Change-Id: I93f0dc721c2eff8a87fb9248882f24768f708713
diff --git a/tests/vty_test_runner.py b/tests/vty_test_runner.py
index afe1cfd..73dd399 100755
--- a/tests/vty_test_runner.py
+++ b/tests/vty_test_runner.py
@@ -75,7 +75,7 @@
                 "doc/examples/osmo-gbproxy/osmo-gbproxy.cfg"]
 
     def vty_app(self):
-        return (4246, "./src/gprs/osmo-gbproxy", "OsmoGbProxy", "bsc")
+        return (4246, "./src/gprs/osmo-gbproxy", "OsmoGbProxy", "gbproxy")
 
     def testVtyTree(self):
         self.vty.enable()