It is better if we let the s3response module handle the xml
formatting spec specifics, and let the backends not worry
about how to format the time fields. This should help to
prevent any future backend modifications or additions from
accidental incorrect time formatting.
Changed ListObjectsV2 and ListObjects actions return types from
*s3.ListObjects(V2)Output to s3response.ListObjects(V2)Result.
Changed the listing objects timestamp to RFC3339 to match AWS
S3 objects timestamp.
Fixes#752
For large directories, the treewalk can take longer than the
client request timeout. If the client times out the request
then we need to stop walking the filesystem and just return
the context error.
This should prevent the gateway from consuming system resources
uneccessarily after an incoming request is terminated.
