FTPSSocketFactory does not override createSocket(); causes 
java.net.SocketException: Unconnected sockets not implemented
------------------------------------------------------------------------------------------------------------------------

                 Key: NET-404
                 URL: https://issues.apache.org/jira/browse/NET-404
             Project: Commons Net
          Issue Type: Bug
          Components: FTP
    Affects Versions: 2.2
            Reporter: Sebb


Adding connect timeout for NET-399 changed the code to use 
socketFactory.createSocket() instead of createSocket(host, port).

As FTPSSocketFactory does not implement createSocket(), this means that the 
context socketFactory is not used, leading to:

{noformat}
java.net.SocketException: Unconnected sockets not implemented
        at javax.net.SocketFactory.createSocket(SocketFactory.java:104)
        at 
org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:714)
        at 
org.apache.commons.net.ftp.FTPSClient._openDataConnection_(FTPSClient.java:549)
{noformat}

Fix is to implement the no-arg createSocket() method.

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