Add support to Dataproc workflows

[davidrabinowitz]

Dataproc has a new workflow implementation (https://cloud.google.com/dataproc/docs/reference/rpc/google.cloud.dataproc.v1beta2#google.cloud.dataproc.v1beta2.WorkflowTemplateService). Is it possible to add a Java client for it?

[andreamlin]

Hello,

The Java clients are refreshed weekly, and the newest client may be out by the end of the week.

[davidrabinowitz]

Notice that workflows are ay the v1beta2 api, is it generated as well?

[yihanzhen]

@danoscarmike Can you verify whether dataproc v1beta2 is ready to be generated?

[danoscarmike]

@hzyi-google as discussed offline - I have added this version to the batch whitelist so it may be included in this week's release.

[yihanzhen]

v1beta2 is now in master.