Default `bsdconfig timezone' and `tzsetup' to `-s' in a VM.

Recommended by:	cperciva
Reviewed by:	cperciva
Relnotes:	tzsetup and bsdconfig now assume that the "hardware" clock inside a VM is set to UTC


git-svn-id: svn+ssh://svn.freebsd.org/base/head@274394 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f