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/Makefile.am b/openbsc/Makefile.am
index 91299f3..d7329ba 100644
--- a/openbsc/Makefile.am
+++ b/openbsc/Makefile.am
@@ -7,7 +7,7 @@
 pkgconfig_DATA = openbsc.pc
 
 BUILT_SOURCES = $(top_srcdir)/.version
-EXTRA_DIST = git-version-gen
+EXTRA_DIST = git-version-gen osmoappdesc.py
 $(top_srcdir)/.version:
 	echo $(VERSION) > $@-t && mv $@-t $@
 dist-hook: