++changes

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
document environment variables that influence cdist

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
also document require variable

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>
setting up CDIST_ALLOW_OVERRIDE to any value is ok - do not depend on true/yes/ja

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>