More KAUTH_GENERIC_ISSUSER replacements

[Elad Efrat <elad%NetBSD.org@localhost>]

Hi,

I would like to introduce the following actions/requests as alternatives
to some KAUTH_GENERIC_ISSUSER uses:

  - KAUTH_SYSTEM_MOUNT::KAUTH_REQ_SYSTEM_MOUNT_UMAP: special request for
    mounting a umapfs. See miscfs/umapfs/umap_vfsops.c.

  - KAUTH_SYSTEM_RESOURCE_RESERVEDSPACE: action for checking whether the
    reserved space allocated on the file-system can be used. See
        ufs/ext2fs/ext2fs_alloc.c and ufs/ffs/ffs_alloc.c.

  - KAUTH_SYSTEM_RESOURCE_QUOTA::KAUTH_REQ_SYSTEM_RESOURCE_QUOTA_ with
    NOLIMIT (check if the quota limit can be bypassed), GET (for reading
        quota information), and MANAGE (check whether the caller can manage
        quota by enabling/disabling it and setting quota for users). See
        ufs/ufs/ufs_quota.c and ufs/ufs/ufs_vfsops.c.

Are there objections for any of the above?

Thanks,

-e.