Google cloud storage doesn't normally need retries, however certain
things (eg bucket creation and removal) are rate limited and do
generate 429 errors.
Before this change the integration tests would regularly blow up with
errors from GCS rate limiting bucket creation and removal.
After this change we low level retry all operations using the same
exponential backoff strategy as used in the google drive backend.
In a typical rclone copy to a bucket/container based remote, before
this change we were doing a list, followed by a HEAD of the bucket to
check it existed before doing the copy. The fact the list succeeded
means the bucket exists so mark it OK at that point.
Issue #1421
The purpose of this is to make it easier to maintain and eventually to
allow the rclone backends to be re-used in other projects without
having to use the rclone configuration system.
The new code layout is documented in CONTRIBUTING.
