4769. [bug] Enforce the requirement that the managed keys
directory (specified by "managed-keys-directory",
and defaulting to the working directory if not
specified) must be writable. [RT #46077]
4080. [func] Completed change #4022, adding a "lock-file" option
to named.conf to override the default lock file,
in addition to the "named -X <filename>" command
line option. Setting the lock file to "none"
using either method disables the check completely.
[RT #37908]
