Foreman Maintain

Refactor rolling back

Simplify the dependency graph

When composing the dependency graph for tsort, use just the collection
it was set to, instead of using resolver to find the classes by label.

Besides simplification, it also preserves the order in which the steps
were added, otherwise, the order was dependent on the Ruby version (and...

Remove the singleton form ObjectCache

The object cache was causing issues when running multiple scenarios in
one run, where the objects from previous step were interfering with the
later scenarios, if the same steps were used in both of them.

Handle migration phase setting when not confirmed

Before this change, the phase was set to new one before the user full
confirmed she wants to proceed with the upgrade, which cause the checks
to be skipped on next run.

Fix whitelist option definition

Advanced run command and tests

Support for run_once procedures and repositories setup

Persists the progress between upgrade runs

Configure repositories and update packages

Update the satellite upgrade to new code