[INTERNAL] moved support for open explorer back to SendFile action

The receive/send file jobs should be generic and only do what they are
supposed to do. As Eclipse offers a good way into hooking into the Job
execution a listener is used instead which will execute the "show file
action" after the job completes successfully.

Change-Id: Ic34d25573c2199f4b49e2a10a56ee6aacffc014f
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1386
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>