Use socket.inet_aton for isIPV4 since Windows doesn't (always?) have inet_pton

Closes: Sf#3430008
Signed-off-by: James McCoy <jamessan@users.sourceforge.net>

src/utils/net.py

@@ -73,7 +73,7 @@ def isIPV4(s):
     0
     """
     try:
-        return bool(socket.inet_pton(socket.AF_INET, s))
+        return bool(socket.inet_aton(s))
     except socket.error:
         return False