timeout: Move from /usr/bin to /bin

timeout: Move from /usr/bin to /bin

timeout(1) is used by /etc/rc.d/zfskeys. Unfortunately, having
timeout(1) installed in /usr/bin causes problems when /usr is an
encrypted ZFS partition.

Implementing timeout(1) in sh(1) is not trivial. A more elegant solution
is to move timeout(1) to /bin so that it is available to early services
in the boot process.

PR:		265221
Reviewed by:	allanjude, des, imp
Approved by:	allanjude, des, imp
Reported by:	Ivan <r4@sovserv.ru>
Fixes:	33ff39796ffe Add zfskeys rc.d script for auto-loading encryption keys
Relnotes:	yes
Sponsored by:	Modirum MDPay
Sponsored by:	Klara Inc.
Differential Revision:	https://reviews.freebsd.org/D38344

(cherry picked from commit e7ab133648a168c4bf7c11da840663c5581771d8)