Rollback iot/api-client/manager.

Author: kurtisvg

iot/api-client/manager/requirements.txt

@@ -1,4 +1,4 @@
-google-api-python-client==1.7.4
+google-api-python-client==1.6.6
 google-auth-httplib2==0.0.3
-google-auth==1.5.1
-google-cloud==0.34.0
+google-auth==1.4.1
+google-cloud==0.32.0