Place test bucket in us-east-2.
Place test bucket in us-east-2.

For reasons unknown to me, the AWS console login is for us-east-1, but
the AWS console immediately shuffles us to us-east-2. This means that if
you do anything in the console, it'll be in us-east-2, and so this
change standardizes the bucket location to there.

Change-Id: Iafb7bbe6d295b2dc43ecf7f078a6918ae50d06a1
Reviewed-on: https://team-review.git.corp.google.com/258401
Reviewed-by: Tuo Shan <e38988508c7dd9b59ee1f5735040284711960df8@google.com>
Reviewed-by: Ross Light <dfccc06f14414bff5a59be7fc90abf4404b47fc8@google.com>

google/go-cloud,google/go-cloud,google/go-cloud