refactor: virtualization api

[yaroslavborbat]

Description

refactor virtualization-api
create a fake APIVirtualMachine resource that will contain all subresources for virtual machine
"/apis/subresources.virtualization.deckhouse.io/v1alpha2/namespaces/<namespace>/apivirtualmachines/<name>/<subresource>"

deckhouse/3p-kubevirt#17

Why do we need it, and what problem does it solve?

What is the expected result?

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: core
type: feature
summary: refactor virtualization-api. create a fake APIVirtualMachine resource that will contain all subresources for virtual machine "/apis/subresources.virtualization.deckhouse.io/v1alpha2/namespaces/<namespace>/apivirtualmachines/<name>/<subresource>"