Rename MINIX service(8) to minix-service(8)

IMPORTANT: this change has a docs/UPDATING entry!

This rename is unfortunately necessary because NetBSD has decided to
create its own service(8) utility,

Rename MINIX service(8) to minix-service(8)

IMPORTANT: this change has a docs/UPDATING entry!

This rename is unfortunately necessary because NetBSD has decided to
create its own service(8) utility, and we will want to import theirs
as well. The two can obviously not coexist.

Also move ours from /bin to /sbin, as it is a superuser-only utility.

Change-Id: Ic6e46ffb3a84b4747d2fdcb0d74e62dbea065039

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