This region seems to take a very long time to launch nodes when we
have a burst of requests for them, like a thundering herd sort of
behavior causing launch times to increase substantially. We have a
lot of capacity in this region though, so want to boot as many
instances as we can here. Attempt to reduce the effect by limiting
the number of instances nodepool will launch at the same time.
Also, mitigate the higher timeout for this provider by not retrying
launch failures, so that we won't ever lock a request for multiples
of the timeout.
Change-Id: I179ab22df37b2f996288820074ec69b8e0a202a5
d0481326bf