major, spawn a /bin/sh per test line and break early on failures

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
major, empty clit scripts aren't failures anymore

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'feat/one-sh-per-run'

* feat/one-sh-per-run:
  major, empty clit scripts aren't failures anymore
  major, spawn a /bin/sh per test line and break early on failures