Fix lack of device ownership enforcement for DVR routers

Fix lack of device ownership enforcement for DVR routers

The enforcement rule was applied to centralized router interfaces, to avoid
a potential security vulnerabilty.

Even though DVR routers are fundamentally different from centralized routers,
there is no good reason as to why the rule should be skipped for DVR interfaces.

This patch sanitizes the insanity a bit and closes this potential loophole by
preventing the operation for DVR routers too.

Related-bug: #1243327
Closes-bug: #1410984

Change-Id: I048e6e3926e1c74cf9ecb63cfb53a0b1afb3c579