soTimeout option is used by SFTP of camel-ftp

According to the document(1), `soTimeout` is used only for `FTP and FTPS`, not SFTP.
However, as long as I read the source code(2), `soTimeout` is used for `Session.setTimeout()`(3) of SFTP. I guess this is a documentation bug.

The source code(2) was fixed by CAMEL-8757(4). I think the modification of the document was missed when to fix.

By the way, our community document(5) is also not correct.

(1) Fuse Document
https://access.redhat.com/documentation/en-us/red_hat_jboss_fuse/6.3/html-single/apache_camel_component_reference/#IDU-FTP2
~~~

• connectTimeout
  • Camel 2.4: Is the connect timeout in millis. This corresponds to using ftpClient.connectTimeout for the FTP/FTPS. For SFTP this option is also used when attempting to connect.
• soTimeout
  • FTP and FTPS Only:Camel 2.4: Is the SocketOptions.SO_TIMEOUT value in millis.
• timeout
  • FTP and FTPS Only:Camel 2.4: Is the data timeout in millis. This corresponds to using ftpClient.dataTimeout for the FTP/FTPS. For SFTP there is no data timeout.
    ~~~

(2) org/apache/camel/component/file/remote/SftpOperations.java

        // set the SO_TIMEOUT for the time after the connect phase
         if (configuration.getSoTimeout() > 0) {
             session.setTimeout(configuration.getSoTimeout());
         }

(3) com.jcraft.jsch.Session Java Doc
https://epaul.github.io/jsch-documentation/simple.javadoc/com/jcraft/jsch/Session.html#setTimeout-int-
~~~
sets the timeout setting. This value is used as the socket timeout parameter, and also as the default connection timeout.
~~~

(4) [CAMEL-8757] SO_TIMEOUT not really set on SFTP connections

• https://issues.apache.org/jira/browse/CAMEL-8757

(5) Community Document
http://people.apache.org/~dkulp/camel/ftp2.html
~~~

• connectTimeout
  • Camel 2.4: Is the connect timeout in millis. This corresponds to using ftpClient.connectTimeout for the FTP/FTPS. For SFTP this option is also used when attempting to connect.
• soTimeout
  • FTP and FTPS Only: Camel 2.4: Is the SocketOptions.SO_TIMEOUT value in millis. Note SFTP will automatic use the connectTimeout as the soTimeout.
• timeout
  • FTP and FTPS Only: Camel 2.4: Is the data timeout in millis. This corresponds to using ftpClient.dataTimeout for the FTP/FTPS. For SFTP there is no data timeout.
    ~~~