Fix publisher throughput when there are no ordering keys.#5607

Merged

sduskis merged 2 commits intogoogleapis:pubsub-ordering-keysfrom

kamalaboulhosn:pubsub-ordering-keys

Jul 1, 2019

Commits on Jun 29, 2019

Fix publisher throughput when there are no ordering keys.
kamalaboulhosn
committed

Commits on Jul 1, 2019

Remove batch from iterator if we are going to process it.
kamalaboulhosn
committed