Foreman Maintain

Refs #25291 - remove dead code

Fixes #25291 - don't add quit action on fail_slow run_strategy

Fixes #25853 - Improved suggestion to whitelist steps

Fixes #29699 - Fix exit code for warning to 78

Along with the fix, added new section for special exit codes in readme file.

Fixes #28281 - no spinner on non-tty output

Refs #28097 - Disable --assumeyes

Refs #28097 - updated formatting of the message

Fixes #26236 - made disk check silent in sat_versions > 6.2

Fixes #24792 - --brief and --failing options in service status

Two new options were added to service status:
--brief (-b) prints only service name and status for quick overview
--failing (-f) lists only services that are not running
Forthermore there was added Sentence at the end of the status which...

Fixes #23498 - run with mongo 3.4 from scl

To get version of the db server (may be remote) we assume the
'mongo' command is always available. If there is only mongo from SCL
present the mongo client has to be called from within a scl.

With current state of things it is safe to assume there is at least...