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
8 files changed