Updates dependencies (GoogleCloudPlatform#1713)

* Updates dependencies
* Upgrades e2e dependencies

Author: gguuss

iot/api-client/end_to_end_example/requirements.txt

@@ -1,7 +1,7 @@
 cryptography==2.2.2
-google-api-python-client==1.6.6
+google-api-python-client==1.7.4
 google-auth-httplib2==0.0.3
-google-auth==1.4.1
-google-cloud-pubsub==0.33.0
+google-auth==1.5.1
+google-cloud-pubsub==0.38.0
 pyjwt==1.6.1
 paho-mqtt==1.3.1

iot/api-client/manager/requirements.txt

@@ -1,4 +1,4 @@
-google-api-python-client==1.6.6
+google-api-python-client==1.7.4
 google-auth-httplib2==0.0.3
-google-auth==1.4.1
-google-cloud==0.32.0
+google-auth==1.5.1
+google-cloud-pubsub==0.38.0