vmm: Enable unprivileged bhyve
- Add the vmm group. - Let /dev/vmmctl belong to the vmm group by default, and give group write permissions. - When creating a VM's device files, make them owned by the creating process' effective UID. Reviewed by: bnovkov MFC after: 2 months Sponsored by: The FreeBSD Foundation Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D54741
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