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 BSC-specific: leftovers from repository split which are now
available in osmo-python-tests as well.
Change-Id: Ia4285b18b152b070c148228604d1e61a8adedba1