testing: start using btlr [(#3959)](GoogleCloudPlatform/python-docs-samples#3959)

* testing: start using btlr

The binary is at gs://cloud-devrel-kokoro-resources/btlr/v0.0.1/btlr

* add period after DIFF_FROM

* use array for btlr args

* fix websocket tests

* add debug message

* wait longer for the server to spin up

* dlp: bump the wait timeout to 10 minutes

* [run] copy noxfile.py to child directory to avoid gcloud issue

* [iam] fix: only display description when the key exists

* use uuid4 instead of uuid1

* [iot] testing: use the same format for registry id

* Stop asserting Out of memory not in the output

* fix missing imports

* [dns] testing: more retries with delay

* [dlp] testing: longer timeout

* use the max-concurrency flag

* use 30 workers

* [monitoring] use multiple projects

* [dlp] testing: longer timeout

Author: Takashi Matsuo

samples/analyze/beta_snippets_test.py

@@ -53,7 +53,7 @@ def video_path(tmpdir_factory):
 @pytest.fixture(scope="function")
 def bucket():
     # Create a temporaty bucket to store annotation output.
-    bucket_name = str(uuid.uuid1())
+    bucket_name = f'tmp-{uuid.uuid4().hex}'
     storage_client = storage.Client()
     bucket = storage_client.create_bucket(bucket_name)