V6: disable-org-isolation: refactor command unit tests
V6: disable-org-isolation: refactor command unit tests

We slimmed-down the command unit tests to prepare for V7 migration.

[finishes #171338834]

Co-authored-by: Weyman Fung <4ab5e17be5c5cdce6cf54d6174afda06421ccec1@pivotal.io>
Co-authored-by: Brian Cunnie <c96b911daecac34294af5ecfb5cb3aa7cd7901af@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli