Add Vendor Extension test plan

We need to add test description for this new feature.

changed milestone to %Release 2

added ScopeDocumentation label

assigned to @jorge.moratinossalcines

added to epic &11 (closed)

created branch OCF-Doc17-add-vendor-extension-test-plan to address this issue

mentioned in merge request !19 (merged)

mentioned in commit b111d3f2

closed with merge request !19 (merged)