iam:access_test.test_set_policy failed

[tmatsuo]

Build:
https://source.cloud.google.com/results/invocations/f7538001-0aa4-41b3-a08e-394c23c10558/targets

Error:

googleapiclient.errors.HttpError: <HttpError 409 when requesting https://cloudresourcemanager.googleapis.com/v1/projects/python-docs-samples-tests:setIamPolicy?alt=json returned "There were concurrent policy changes. Please retry the whole read-modify-write with exponential backoff.">

[tmatsuo]

The resource name in the test is created by the following code:

rand = str(random.randint(0, 1000))
name = "python-test-" + rand

I think it actually conflicted among the multiple builds. I'm going to use uuid and it'll be fine.