Revert "[TASK] Remove dummy files from ext:install"

Test fail, reverted for now, will be redone.

This reverts commit a35b7653c5a4d26cb9a224bc962e5b59886c49b5

Change-Id: I72f35279b44a54fc81170bc272c01a88151241d7
Reviewed-on: https://review.typo3.org/20485
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn