Auto-update dependencies. [(#1980)](GoogleCloudPlatform/python-docs-samples#1980)

* Auto-update dependencies.

* Update requirements.txt

* Update requirements.txt

Author: dpebot

samples/api-client/manager/requirements.txt

@@ -1,10 +1,10 @@
-cryptography==2.4.2
+cryptography==2.5
 flaky==3.5.3
 gcp-devrel-py-tools==0.0.15
-google-api-python-client==1.7.5
+google-api-python-client==1.7.8
 google-auth-httplib2==0.0.3
-google-auth==1.6.1
-google-cloud-pubsub==0.39.0
+google-auth==1.6.2
+google-cloud-pubsub==0.39.1
 oauth2client==4.1.3
 paho-mqtt==1.4.0
-pyjwt==1.6.4
+pyjwt==1.7.1