Revert "Add a run-as-user service wrapper"
Revert "Add a run-as-user service wrapper"

We're going to try to avoid modifying passwd as much as possible, see
discussion at
https://github.com/zalora/defnix/commit/34dd080d4f40e77655357e126b07e8bd04131a06#commitcomment-8885919.

This reverts commit 1870adb60dd8107883ea786f9b1757fc99c6e3fa.

zalora/deployix,zalora/defnix,shlevy/defnix,zalora/defnix,zalora/deployix,shlevy/defnix