named_chrootdir IS set, named-checkconf fails because it
cannot find the conf file. Fix this by making checkconf a
variable that includes "-t $named_chrootdir" as needed.
Notice of the bug and suggested direction for the fix from [1].
Using required_files for named.conf is overkill ever since
I added the named-checkconf call, so rather than update the
logic to handle the case described above, remove it. This
also handles the case where named_chroot_autoupdate IS set
but the symlink doesn't exist yet.
PR: conf/145904
Submitted by: J R Matthews
a16334d031