move ipaddrs.py from wormhole.util to wormhole.twisted

src/wormhole/twisted/transit.py

@@ -8,10 +8,10 @@ from twisted.internet import (reactor, interfaces, defer, protocol,
 from twisted.internet.defer import inlineCallbacks, returnValue
 from twisted.protocols import policies
 from nacl.secret import SecretBox
-from ..util import ipaddrs
 from ..util.hkdf import HKDF
 from ..errors import UsageError
 from ..timing import DebugTiming
+from . import ipaddrs
 
 def debug(msg):
     if False: