GoogleCloudPlatform / google-cloud-java / 3980

72%

Pull #2104

travis-ci

pubsub: start subscriber connections quickly again

This PR undoes part of #2055.
Refreshing credentials blocks thread for a period of time.
Previously, each channel has its own credentials,
so starting many channels spams executor with many blocking tasks.
but the downside is we take a long time to fully start:
about 2 minutes on my machine.

Now, all connections share the same credentials,
so refreshing only happens once.
We can start quickly again.

Also rename setLeaseAlarmsExecutorProvider,
since the executor is now also used for polling.

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