[Bug 291948] Stop using NetApp's OUI for generated MAC addresses

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291948

            Bug ID: 291948
           Summary: Stop using NetApp's OUI for generated MAC addresses
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bhyve
          Assignee: virtualization@FreeBSD.org
          Reporter: michaelo@FreeBSD.org

If a MAC address is not supplied for a NIC the code says:
> ./usr.sbin/bhyve/net_utils.c:    * The default MAC address is the standard NetApp OUI of 00-a0-98,
We should stop using NetApp's OUI (see net_genmac()). The manpage says:

> If mac is not specified, the MAC address is derived from a
> fixed OUI and the remaining bytes from an MD5 hash of the
> slot and function numbers and the device name.
Since "fixed" is not specified it is implementation specific and can be changed
anytime. AT least 16-CURRENT shall use 58:9C:FC.

It needs to be made sure that the generated MAC address is within
> ./sys/net/ieee_oui.h:#define OUI_FREEBSD_BHYVE_LOW      OUI_FREEBSD(0x000001)
> ./sys/net/ieee_oui.h:#define OUI_FREEBSD_BHYVE_HIGH     OUI_FREEBSD(0x0fffff)

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