Dsub

This release includes:

* Support for [Requester Pays buckets](https://cloud.google.com/storage/docs/requester-pays) via the new `--user-project` option (`google-v2` and `local` providers)
* Fixes `dstat ... --limit` off-by-one bug

This release includes:

- Documentation updates noting the deprecation of the google provider.
- `google-v2` provider updates:
- `--log-interval` flag to configure the amount of time to sleep between copying log files from the pipeline to the logging path.
- Adding `google-v2` specific elements to `dstat` output.
- `--ssh` flag to start an SSH container in the background, allowing you to inspect the runtime
environment of your job's container in real time.
- Experimental support for gcsfuse through the `--mount` flag.
- `local` provider updates:
- Add support for Docker images with entrypoints

This release includes:

- Experimental Python 3 support.
- Improvements to retry logic on transient HTTP errors.
- `google-v2` provider:
- `dstat` fixes:
- Fix for "ok" event in the wrong order.
- Decreased operations.list page size to work around quota exception.
- Fix for 'pulling-image' event discovery.
- `dsub` fixes:
- Fix pipeline hang in localization/delocalization on error on multi-core VMs

This release includes:

- `google-v2` provider:
- Support for `--network`, `--cpu-platform`, `--timeout` parameters
- Add events to dstat.list for google V2 provider
- Using `--min-cores` or `--min-ram` now directs users to `--machine-type`

- Add Finland and Los Angeles regions and new Singapore zone.
- Various test suite improvements

Note that this release includes an important change to the way that log file names are formatted for `dsub` jobs that use `--retries`. The `task-attempt` is now automatically included in the log file name such that logs for each attempt do not overwrite the previous attempt.

All unit and integration tests now pass for the `google-v2` provider.
Users interested in [Google's Pipelines v2](https://cloud.google.com/genomics/reference/rest/v2alpha1/pipelines) are encouraged to give it a try.

This release includes:

* `google-v2` provider:
* `dstat` fields such as `envs`, `inputs`, `outputs`, and `logging` now supported.
* `ddel` supported

* General
* `dsub` returns task-id even if failure is detected when using `--wait`.
* `events` included in `dstat` output (`local` and `google` providers)

This release includes:

* Initial support of `dsub` automatic retries
* `dstat` support for the `--summary` flag, providing a more compact output for `--tasks` jobs
* Provider improvements
* Local provider
* Use parallel copy for localizing and de-localizing files
* Deterministic `dstat` response ordering
* Google-v2 provider (still in progress)
* File localization/delocalization
* v2alpha1 timestamp format support
* Various test suite fixes