Remove cloud config fixture [(#887)](GoogleCloudPlatform/python-docs-samples#887)

* Remove cloud config fixture

* Fix client secrets

* Fix bigtable instance

Author: Jon Wayne Parrott

samples/snippets/dataproc_e2e_test.py

@@ -16,16 +16,20 @@
 submits a job to Dataproc that runs the pyspark file, then downloads
 the output logs from Cloud Storage and verifies the expected output."""
 
+import os
+
 from gcp.testing.flaky import flaky
 
 import create_cluster_and_submit_job
 
+PROJECT = os.environ['GCLOUD_PROJECT']
+BUCKET = os.environ['CLOUD_STORAGE_BUCKET']
 CLUSTER_NAME = 'testcluster2'
 ZONE = 'us-central1-b'
 
 
 @flaky
-def test_e2e(cloud_config):
+def test_e2e():
     output = create_cluster_and_submit_job.main(
-        cloud_config.project, ZONE, CLUSTER_NAME, cloud_config.storage_bucket)
+        PROJECT, ZONE, CLUSTER_NAME, BUCKET)
     assert b"['Hello,', 'dog', 'elephant', 'panther', 'world!']" in output