[Bug 208910] if_bridge does not work properly with vlans and VIMAGE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208910

            Bug ID: 208910
           Summary: if_bridge does not work properly with vlans and VIMAGE
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: heliocentric at gmail.com

VIMAGE network stacks have issues with a bridge on top of a vlan interface.
This limits the utility of having many jails on a freebsd host where the jails
are bound to multiple vlans, resulting in having to bridge the entire trunk
port to work around it, which can be a security risk.

A patch was already introduced to truenas by delphij a few years ago, and it
was confirmed to work on 10.3-RELEASE:

https://github.com/trueos/trueos/commit/02859369158af2ae3bcb6a9e4434841239f7c526.diff

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