Review FTP and File transports to unify moveTo, autoDelete (and possibly workDir) behaviour

• User impact:

  Medium
• Affects Docs:

  Yes
• Similar Issues:

  None

Currently we have different behaviours in the FTP and the file transport:

• file transport moves the file to the moveToDir before it constructs the MuleMessage and routes it
• FTP transport first routes the MuleMessage and moves to moveToDir afterwards

Since both transports are roughly the same they should show the same behaviour.