Foreman Maintain

Add --whitelist option

Allows to mark some steps to be ignored in the results: allows to
continue even when some checks are failing.

Full upgrade scenario

This commit intoroduces more structured upgrade scenario consisting of
this scenarios:

• pre_upgrade_check - non-modifying checks: is the system ready?
• pre_migrations - modifying procedures before source update
• migrations - source update and main migrations...

Retain original objects while Tsorting. TSort create label graph and then convert to object graph

Define order using ruby TSort

1. Introduce 2 metadata: 'before' and 'after'
2. Current order is:
Checks::SyncPlans::WithEnabledStatus
Checks::DiskSpeedMinimal
Checks::SystemRegistration
Checks::ForemanTasks::NotPaused
Checks::ForemanTasks::NotRunning
Checks::ForemanTasks::Invalid::CheckOld...

Improve reporting on hammer setup and preparation steps

Hammer setup preparation step

Introduce required params

Install required packages as the first one

Run confine against classes, not objects

This allows us to have multiple objects of the same procedure in the
system, differing in the constructor parameters. Useful for parametrized
procedures.

Extract metadata DSL to separate namespace

Having the DSL methods directly on the classes caused issues when
needing to query the metadata later.

Allow running checks by label

tests for health commands

CLI basic structure

Refactor: make autodetect opt-out

Refactor

Tests for runner and reporter

WIP: check scenarios