The problem is that currently when sending files to remote server the task seems to be stuck on "SSH: Connecting...".

      So some kind of feedback is needed (at least as an option) to show at least information about files that are being transfer e.g.:
      ```
      SSH: Transfering 'some-workspace-subdir/some-file-name.war'...
      ```

      Or even better – for large files or slow transfer – show progress every 30 seconds like so:
      ```
      SSH: Transfering 'large-file.iso'...
      15% complete...
      31% complete...
      44% complete...
      Done.
      SSH: Transfering 'small-file.sh'...
      Done.
      ```

      30 seconds feedback is just my personal preference - it could be configurable too.

          [JENKINS-25931] File transfer progress feedback

          Maciej Jaros created issue -
          R. Tyler Croy made changes -
          Workflow Original: JNJira [ 159918 ] New: JNJira + In-Review [ 180178 ]
          Alex Earl made changes -
          Assignee Original: bap [ bap ] New: Alex Earl [ slide_o_mix ]
          Alex Earl made changes -
          Status Original: Open [ 1 ] New: In Progress [ 3 ]
          Alex Earl made changes -
          Assignee Original: Alex Earl [ slide_o_mix ]
          Gavin McDonald made changes -
          Resolution New: Incomplete [ 4 ]
          Status Original: In Progress [ 3 ] New: Closed [ 6 ]

            Unassigned Unassigned
            nux Maciej Jaros
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              Created:
              Updated:
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