FTPS: Hook to customize _openDataConnection_ SSLSocket before startHandshake() 
is called
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                 Key: NET-426
                 URL: https://issues.apache.org/jira/browse/NET-426
             Project: Commons Net
          Issue Type: Bug
          Components: FTP
    Affects Versions: 3.0.1
            Reporter: Ketan
            Priority: Critical


Currently in FTPSClient class, there is protected _openDataConnection_ method, 
which create SSLSocket for data connection.  But there is no hook to customize 
the SSLSocket before startHandshake is called.  

I need to know the remote host ip and port, which i can get for socket, and do 
custom setup to try to reuse SSL sessions from control connection socket.  
Since the socket factory uses createSocket() method, I can't just use custom 
socket factory since I don't know the host and port.  I can't just override the 
_openDataConnection_() method in my class since that will call the 
startHandshake().  

So it would be nice if you can provide hook, much like _connectAction_(), but 
for data connection before handshake is started.  You can pass the new data 
socket as argument to this hook method so one can get remote host and port 
information.  

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