Move twisted_ipa.py to osmopy lib

twisted_ipa is a module expected to be used by other python scripts, so
move it to osmopy dir to be installed as a lib (in python path) so it
can be later used.

twisted_ipa has some features to use it standalone for testing purposes.
This feature can still be used from new installation path.

Change-Id: I33a0c4263297abd9e111bf43e6e9967c06474318
diff --git a/scripts/soap.py b/scripts/soap.py
index f1da8f2..dc06e1e 100755
--- a/scripts/soap.py
+++ b/scripts/soap.py
@@ -25,7 +25,7 @@
 __version__ = "0.7.1" # bump this on every non-trivial change
 
 from twisted.internet import defer, reactor
-from twisted_ipa import CTRL, IPAFactory, __version__ as twisted_ipa_version
+from osmopy.twisted_ipa import CTRL, IPAFactory, __version__ as twisted_ipa_version
 from osmopy.osmo_ipa import Ctrl
 from treq import post, collect
 from suds.client import Client