Various S3 related bugs

[stroomdev10]

If I attempt to download an S3 Stream , I get

Download failed with errors: java.nio.file.NoSuchFileException: /xxx/xxx/stroomtmp/s3_cache/xxx/001.ctx

Also when running Data Delete I get failures on every S3 file, then

Data Delete - Skipping file deletion for stream 4294525 as failure threshold exceeded 100. See property stroom.data.store.deleteFailureThreshold"