Introduced support for external python tests

The test scripts warn about missing documentation, untested configs,
check common errors, and stub out testing individual VTY commands.
The scripts have been moved to the another osmocom repository,
python/osmo-python-tests

The features were requested by zecke.
diff --git a/openbsc/doc/examples/osmo-sgsn/osmo-sgsn.cfg b/openbsc/doc/examples/osmo-sgsn/osmo-sgsn.cfg
index 027c03d..4955983 100644
--- a/openbsc/doc/examples/osmo-sgsn/osmo-sgsn.cfg
+++ b/openbsc/doc/examples/osmo-sgsn/osmo-sgsn.cfg
@@ -6,8 +6,8 @@
  no login
 !
 sgsn
- gtp local-ip 10.23.23.23
- ggsn 0 remote-ip 192.168.0.101
+ gtp local-ip 127.0.0.1
+ ggsn 0 remote-ip 127.0.0.1
  ggsn 0 gtp-version 1
 !
 ns
@@ -18,7 +18,7 @@
  timer tns-test 30
  timer tns-alive 3
  timer tns-alive-retries 10
- encapsulation udp local-ip 192.168.0.101
+ encapsulation udp local-ip 127.0.0.1
  encapsulation udp local-port 23000
  encapsulation framerelay-gre enabled 0
 !