p2p: Drop roles from sendtxrcncl

This feature was currently redundant (although could have provided
more flexibility in the future), and already been causing confusion.

test/functional/test_framework/messages.py

@@ -1840,29 +1840,23 @@ class msg_cfcheckpt:
             self.filter_type, self.stop_hash)
 
 class msg_sendtxrcncl:
-    __slots__ = ("initiator", "responder", "version", "salt")
+    __slots__ = ("version", "salt")
     msgtype = b"sendtxrcncl"
 
     def __init__(self):
-        self.initiator = False
-        self.responder = False
         self.version = 0
         self.salt = 0
 
     def deserialize(self, f):
-        self.initiator = struct.unpack("<?", f.read(1))[0]
-        self.responder = struct.unpack("<?", f.read(1))[0]
         self.version = struct.unpack("<I", f.read(4))[0]
         self.salt = struct.unpack("<Q", f.read(8))[0]
 
     def serialize(self):
         r = b""
-        r += struct.pack("<?", self.initiator)
-        r += struct.pack("<?", self.responder)
         r += struct.pack("<I", self.version)
         r += struct.pack("<Q", self.salt)
         return r
 
     def __repr__(self):
-        return "msg_sendtxrcncl(initiator=%i, responder=%i, version=%lu, salt=%lu)" %\
-            (self.initiator, self.responder, self.version, self.salt)
+        return "msg_sendtxrcncl(version=%lu, salt=%lu)" %\
+            (self.version, self.salt)