[Bug 254445] cloned_interfaces="bridge0" does not respect net.inet6.ip6.auto_linklocal

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254445

            Bug ID: 254445
           Summary: cloned_interfaces="bridge0" does not respect
                    net.inet6.ip6.auto_linklocal
           Product: Base System
           Version: 13.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: conf
          Assignee: bugs at FreeBSD.org
          Reporter: john at saltant.com
             Flags: mfc-stable13?

Expected behavior
-----------------

When creating a IPv6-enabled bridge interface, the AUTO_LINKLOCAL flag will be
set automatically, and the interface will be assigned a link-local address.

Observed behavior
-----------------

The IPv6-enabled bridge interface does not have a link-local address, even if a
globally-unique address is assigned to affirm the IPv6 intent.

First observed on 12.1-RELEASE amd64, observed again on 12.2-RELEASE-p4 amd64,
reproduced on 13.0-RC3 aarch64 EC2 AMI.

Steps to reproduce
------------------

Verify that net.inet6.ip6.auto_linklocal==1.

Set cloned_interfaces="bridge0" and reboot.

Verify that AUTO_LINKLOCAL is not set on bridge0.

Then set ifconfig_bridge0_ipv6="inet6 2001:db8::1/64" and reboot.

Verify that AUTO_LINKLOCAL is not set on bridge0.

Note that AWS AMIs set ipv6_activate_all_interfaces="YES" by default.

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