Auto-update dependencies. [(#1005)](GoogleCloudPlatform/python-docs-samples#1005)

* Auto-update dependencies.

* Fix bigtable lint

* Fix IOT iam interaction

Author: dpebot

samples/api-client/manager/manager.py

@@ -51,7 +51,7 @@ def create_iot_topic(topic_name):
     topic = pubsub_client.topic(topic_name)
     policy = topic.get_iam_policy()
     publishers = policy.get('roles/pubsub.publisher', [])
-    publishers.append(policy.service_account(
+    publishers.add(policy.service_account(
             '[email protected]'))
     policy['roles/pubsub.publisher'] = publishers
     topic.set_iam_policy(policy)

samples/api-client/manager/requirements.txt

@@ -1,4 +1,4 @@
 google-api-python-client==1.6.2
 google-auth-httplib2==0.0.2
 google-auth==1.0.1
-google-cloud==0.25.0
+google-cloud==0.26.0