examples/sgsn: Use osmo-hlr with auth-policy remote by default

For the vty tests, add osmo-sgsn-accept-all.cfg (that does not need an HLR) and
use in vty_test_runner.py, otherwise the 'show sgsn' command will reply that it
could not connect to the HLR, failing the vty test which expects empty.

Change-Id: Ie3b2013198d3e2b780a4e31c36b89b58129dcacd
diff --git a/tests/vty_test_runner.py b/tests/vty_test_runner.py
index fe4d3f0..7d4e121 100644
--- a/tests/vty_test_runner.py
+++ b/tests/vty_test_runner.py
@@ -829,7 +829,7 @@
 
     def vty_command(self):
         return ["./src/gprs/osmo-sgsn", "-c",
-                "doc/examples/osmo-sgsn/osmo-sgsn.cfg"]
+                "doc/examples/osmo-sgsn/osmo-sgsn-accept-all.cfg"]
 
     def vty_app(self):
         return (4245, "./src/gprs/osmo-sgsn", "OsmoSGSN", "sgsn")