Do not deduce VCN capability if Builder is derived from request

If the caller constructed the builder from a request, it means
the user might explicitly want the capabilities from the request.
Thus, the NOT_VCN_MANAGED capabilities should not be touched
later.

Test: TH
Fix: 185876442
Change-Id: I92037cc8547fb72de12d6b6402f060f6c98e1853