[tests] Move version message sending from NodeConn to NodeConnCB

This commit moves the logic that sends a version message
on connection from NodeConn to NodeConnCB. NodeConn should
not be aware of the semantics or meaning of the P2P payloads.

test/functional/test_framework/mininode.py

@@ -75,7 +75,7 @@ class NodeConn(asyncore.dispatcher):
     def __init__(self):
         super().__init__(map=mininode_socket_map)
 
-    def peer_connect(self, dstaddr, dstport, net="regtest", services=NODE_NETWORK|NODE_WITNESS, send_version=True):
+    def peer_connect(self, dstaddr, dstport, net="regtest"):
         self.dstaddr = dstaddr
         self.dstport = dstport
         self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
@@ -86,16 +86,6 @@ def peer_connect(self, dstaddr, dstport, net="regtest", services=NODE_NETWORK|NO
         self.network = net
         self.disconnect = False
 
-        if send_version:
-            # stuff version msg into sendbuf
-            vt = msg_version()
-            vt.nServices = services
-            vt.addrTo.ip = self.dstaddr
-            vt.addrTo.port = self.dstport
-            vt.addrFrom.ip = "0.0.0.0"
-            vt.addrFrom.port = 0
-            self.send_message(vt, True)
-
         logger.info('Connecting to Bitcoin Node: %s:%d' % (self.dstaddr, self.dstport))
 
         try:
@@ -279,6 +269,19 @@ def __init__(self):
         # The network services received from the peer
         self.nServices = 0
 
+    def peer_connect(self, *args, services=NODE_NETWORK|NODE_WITNESS, send_version=True, **kwargs):
+        super().peer_connect(*args, **kwargs)
+
+        if send_version:
+            # Send a version msg
+            vt = msg_version()
+            vt.nServices = services
+            vt.addrTo.ip = self.dstaddr
+            vt.addrTo.port = self.dstport
+            vt.addrFrom.ip = "0.0.0.0"
+            vt.addrFrom.port = 0
+            self.send_message(vt, True)
+
     # Message receiving methods
 
     def on_message(self, message):