Adds tests, CLI, and fixes some tiny bugs. [(#973)](GoogleCloudPlatform/python-docs-samples#973)

* Adds tests, CLI, and fixes some tiny bugs.

* Fixes lint and adds fake certs for tests.

* Print is a function.

* I had to change something to retrigger tests

* Address review comments

* Import order style

Author: gguuss

samples/api-client/manager/README.md

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+.. This file is automatically generated. Do not edit this file directly.
+
+Google Cloud IoT Core API Python Samples
+===============================================================================
+
+This directory contains samples for Google Cloud IoT Core API. `Google Cloud IoT Core`_ allows developers to easily integrate Publish and Subscribe functionality with devices and programmatically manage device authorization.
+
+
+
+
+.. _Google Cloud IoT Core API: https://cloud.google.com/vision/docs 
+
+Setup
+-------------------------------------------------------------------------------
+
+
+Authentication
+++++++++++++++
+
+Authentication is typically done through `Application Default Credentials`_,
+which means you do not have to change the code to authenticate as long as
+your environment has credentials. You have a few options for setting up
+authentication:
+
+#. When running locally, use the `Google Cloud SDK`_
+
+    .. code-block:: bash
+
+        gcloud auth application-default login
+
+
+#. When running on App Engine or Compute Engine, credentials are already
+   set-up. However, you may need to configure your Compute Engine instance
+   with `additional scopes`_.
+
+#. You can create a `Service Account key file`_. This file can be used to
+   authenticate to Google Cloud Platform services from any environment. To use
+   the file, set the ``GOOGLE_APPLICATION_CREDENTIALS`` environment variable to
+   the path to the key file, for example:
+
+    .. code-block:: bash
+
+        export GOOGLE_APPLICATION_CREDENTIALS=/path/to/service_account.json
+
+.. _Application Default Credentials: https://cloud.google.com/docs/authentication#getting_credentials_for_server-centric_flow
+.. _additional scopes: https://cloud.google.com/compute/docs/authentication#using
+.. _Service Account key file: https://developers.google.com/identity/protocols/OAuth2ServiceAccount#creatinganaccount
+
+Install Dependencies
+++++++++++++++++++++
+
+#. Install `pip`_ and `virtualenv`_ if you do not already have them.
+
+#. Create a virtualenv. Samples are compatible with Python 2.7 and 3.4+.
+
+    .. code-block:: bash
+
+        $ virtualenv env
+        $ source env/bin/activate
+
+#. Install the dependencies needed to run the samples.
+
+    .. code-block:: bash
+
+        $ pip install -r requirements.txt
+
+.. _pip: https://pip.pypa.io/
+.. _virtualenv: https://virtualenv.pypa.io/
+
+Samples
+-------------------------------------------------------------------------------
+
+Manager
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+
+
+To run this sample:
+
+.. code-block:: bash
+
+    $ python manager.py
+
+    usage: manager.py [-h] --project_id PROJECT_ID --pubsub_topic PUBSUB_TOPIC
+                      --api_key API_KEY [--ec_public_key_file EC_PUBLIC_KEY_FILE]
+                      [--rsa_certificate_file RSA_CERTIFICATE_FILE]
+                      [--cloud_region CLOUD_REGION]
+                      [--service_account_json SERVICE_ACCOUNT_JSON]
+                      [--registry_id REGISTRY_ID] [--device_id DEVICE_ID]
+                      {create-es256,create-registry,create-rsa256,create-topic,create-unauth,delete-device,delete-registry,get,list,patch-es256,patch-rs256}
+                      ...
+    
+    Example of using the Google Cloud IoT Core device manager to administer
+    devices.
+    
+    Usage example:
+    
+        python manager.py \
+          --project_id=my-project-id \
+          --pubsub_topic=projects/my-project-id/topics/my-topic-id \
+          --api_key=YOUR_API_KEY \
+          --ec_public_key_file=../ec_public.pem \
+          --rsa_certificate_file=../rsa_cert.pem \
+          --service_account_json=$HOME/service_account.json
+          list
+    
+    positional arguments:
+      {create-es256,create-registry,create-rsa256,create-topic,create-unauth,delete-device,delete-registry,get,list,patch-es256,patch-rs256}
+        create-es256        Create a new device with the given id, using ES256 for
+                            authentication.
+        create-registry     Gets or creates a device registry.
+        create-rsa256       Create a new device with the given id, using RS256 for
+                            authentication.
+        create-topic        Creates a PubSub Topic and grants access to Cloud IoT
+                            Core.
+        create-unauth       Create a new device without authentication.
+        delete-device       Delete the device with the given id.
+        delete-registry     Deletes the specified registry.
+        get                 Retrieve the device with the given id.
+        list                List all devices in the registry.
+        patch-es256         Patch the device to add an ES256 public key to the
+                            device.
+        patch-rs256         Patch the device to add an RSA256 public key to the
+                            device.
+    
+    optional arguments:
+      -h, --help            show this help message and exit
+      --project_id PROJECT_ID
+                            GCP cloud project name.
+      --pubsub_topic PUBSUB_TOPIC
+                            Google Cloud Pub/Sub topic. Format is
+                            projects/project_id/topics/topic-id
+      --api_key API_KEY     Your API key.
+      --ec_public_key_file EC_PUBLIC_KEY_FILE
+                            Path to public ES256 key file.
+      --rsa_certificate_file RSA_CERTIFICATE_FILE
+                            Path to RS256 certificate file.
+      --cloud_region CLOUD_REGION
+                            GCP cloud region
+      --service_account_json SERVICE_ACCOUNT_JSON
+                            Path to service account json file.
+      --registry_id REGISTRY_ID
+                            Registry id. If not set, a name will be generated.
+      --device_id DEVICE_ID
+                            Device id.
+
+
+
+
+.. _Google Cloud SDK: https://cloud.google.com/sdk/

samples/api-client/manager/README.rst

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+# This file is used to generate README.rst
+
+product:
+  name: Google Cloud IoT Core API
+  short_name: Cloud IoT Core
+  url: https://cloud.google.com/vision/docs
+  description: >
+    `Google Cloud IoT Core`_ allows developers to easily integrate Publish and
+    Subscribe functionality with devices and programmatically manage device
+    authorization.
+
+setup:
+- auth
+- install_deps
+
+samples:
+- name: Manager
+  file: manager.py
+  show_help: True
+
+cloud_client_library: false