bsdconfig: add datetime module for live system clock

Provide bsdconfig datetime (menu), date, and time to set the running
system clock via dialog(1)/bsddialog(1) --calendar and --timebox with
mustbe

bsdconfig: add datetime module for live system clock

Provide bsdconfig datetime (menu), date, and time to set the running
system clock via dialog(1)/bsddialog(1) --calendar and --timebox with
mustberoot. Unlike bsdinstall's time helper, this operates on the live
system rather than a CHROOT-staged install target, and calls
adjkerntz(8) after a successful change so the CMOS stays in sync.

Reviewed by: bcr
Differential Revision: https://reviews.freebsd.org/D58487

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