[Bug 274824] if_bridge / if_epair: unable to delete an arp entry after deleting associated route

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274824

            Bug ID: 274824
           Summary: if_bridge / if_epair: unable to delete an arp entry
                    after deleting associated route
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pat@patmaddox.com

Created attachment 246014
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=246014&action=edit
demonstrate the buggy behavior in this PR

1. Create a bridge interface
2. Add a route to an IP address using `-iface bridge`
3. Add an arp entry for that IP
4. Delete the route
5. Delete the arp entry.

Expected result: arp entry is deleted
Actual result: "arp: writing to routing socket: No such file or directory"

The attached script (requires root) demonstrates the behavior. You can run it
as:

./arp_bug.sh bridge
./arp_bug.sh epair
./arp_bug.sh <iface>

Some notes:

- epair and bridge behave the same - the `sleep` calls are not necessary for
them
- my `wlan0` doesn't fail under the same condition. It does seem to have a race
condition, which is why I added `sleep`. It fails with the same error message,
but after the route has been re-added.

I'm not certain I've diagnosed this correctly, but I've done my best - and the
script should demonstrate it.

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