[jetty/f18] (3 commits) ...Create work directory if not exists

[Mikolaj Izdebski]

Summary of changes:

  c97f34c... Don't redirect useradd and groupadd output to the bit bucke (*)
  1806663... Convert systemd scriplets to macros, resolves #850176 (*)
  aaf8790... Create work directory if not exists

(*) This commit already existed in another branch; no separate mail sent