Remove unneeded .py scripts

The ipa.py has been moved to osmo-python-tests as osmo_ipa - use it for
vty and ctrl tests instead of local copy. The soap.py and twisted_ipa.py
are not SGSN-specific: leftovers from repository split which are now
available in osmo-python-tests as well.

Change-Id: I3ef4ca790878921a5846f64942a8de8a6ff9c11c
diff --git a/tests/vty_test_runner.py b/tests/vty_test_runner.py
index eeb151c..afe1cfd 100755
--- a/tests/vty_test_runner.py
+++ b/tests/vty_test_runner.py
@@ -23,11 +23,7 @@
 
 import osmopy.obscvty as obscvty
 import osmopy.osmoutil as osmoutil
-
-# add $top_srcdir/contrib to find ipa.py
-sys.path.append(os.path.join(sys.path[0], '..', 'contrib'))
-
-from ipa import IPA
+from osmopy.osmo_ipa import IPA
 
 # to be able to find $top_srcdir/doc/...
 confpath = os.path.join(sys.path[0], '..')