Move logic from upgrade.sh to upgrade system

Registered by Evgeniy L

In upgrade.sh script we have several methods which related to upgarde.
In order to have better test coverage and supportability need to move this logic to fuel_upgrade_system.

Examples of parameters which should be implemented in upgrade system

--version
--switch-to-version

Blueprint information

Status:
Not started
Approver:
Dmitry Pyzhov
Priority:
Medium
Drafter:
Evgeniy L
Direction:
Needs approval
Assignee:
Fuel Python (Deprecated)
Definition:
New
Series goal:
Accepted for future
Implementation:
Not started
Milestone target:
milestone icon next

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