Foreman Maintain

Fixes #26779 - Check server response via non-auth call

This patch reimplements hammer ping to use simple net::http
call instead of hammer. The main advantage is we can easily
skip the hammer auth setup which is not required for the call.
Another advantage is we can extend ping to pure foreman...

Fixes #24794 - Check tasks after ping is checked and services up

Fixes #21118 - Verify if there are no any running tasks

Fixes #20847 - Unify steps description

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...

Fixes #59 - missing error for hammer-config file

RFE #16 - Delete invalid tasks

Fixes #44 - Change tag 'basic' to 'default'

Add tests for tasks paused check and additional procedures