Fix off-by-one error in maximum keyfile size.
Allow keyfiles up to DEFAULT_KEYFILE_SIZE_MAXKB * 1024 bytes in size by default, and not that value minus one as it is now.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Allow keyfiles up to DEFAULT_KEYFILE_SIZE_MAXKB * 1024 bytes in size by default, and not that value minus one as it is now.