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/doc/examples/osmo-sgsn/osmo-sgsn.cfg b/doc/examples/osmo-sgsn/osmo-sgsn.cfg
index 3f39397..9703c23 100644
--- a/doc/examples/osmo-sgsn/osmo-sgsn.cfg
+++ b/doc/examples/osmo-sgsn/osmo-sgsn.cfg
@@ -9,6 +9,9 @@
  gtp local-ip 127.0.0.1
  ggsn 0 remote-ip 127.0.0.2
  ggsn 0 gtp-version 1
+ auth-policy remote
+ gsup remote-ip 127.0.0.1
+ gsup remote-port 2222
 !
 ns
  timer tns-block 3