Revert "Add gsutil 4.13 to telemetry/third_party"

tools/telemetry/third_party/gsutil/third_party/gcs-oauth2-boto-plugin/README.md

Index: tools/telemetry/third_party/gsutil/third_party/gcs-oauth2-boto-plugin/README.md
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-# gcs-oauth2-boto-plugin
-
-gcs-oauth2-boto-plugin is a Python application whose purpose is to behave as
-an auth plugin for the [boto] auth plugin framework for use with [OAuth 2.0]
-credentials for the Google Cloud Platform. This plugin is compatible with
-both [user accounts] and [service accounts], and its functionality is
-essentially a wrapper around the oauth2client package of
-[google-api-python-client] with the addition of automatically caching tokens
-for the machine in a thread- and process-safe fashion.
-
-For more information about how to use this plugin to access Google Cloud Storage
-via boto in your application, see the [GCS documentation].
-
-If you wish to use this plugin without using the PyPI install as instructed in
-the documentation (e.g., for development), then you will need to manually
-acquire the modules from the requirements.txt file.
-
-
-When using this plugin, you must specify a client ID and secret. We offer the
-following methods for providing this information; if multiple methods are used,
-we will choose them in the following order:
-
-1. .boto config, if not set
-2. environment variables (OAUTH2_CLIENT_ID and OAUTH2_CLIENT_SECRET), if not set
-3. CLIENT_ID and CLIENT_SECRET values set by SetFallbackClientIdAndSecret function.
-
-Service accounts are supported via key files in either JSON or .p12 format.
-The file is first interpreted as JSON, with .p12 format as a fallback.
-
-The default locking mechanism used is threading.Lock. You can switch to using
-another locking mechanism by calling SetLock. Example:
-
-```
-SetLock(multiprocessing.Manager().Lock())
-```
-
-
-Before submitting any code, please run the tests (e.g., by running the following
-command from the root of this repository):
-
-    PYTHONPATH="." python -m gcs_oauth2_boto_plugin.test_oauth2_client
-
-[boto]: https://github.com/boto/boto
-[OAuth 2.0]: https://developers.google.com/accounts/docs/OAuth2Login
-[user accounts]: https://developers.google.com/accounts/docs/OAuth2#installed
-[service accounts]: https://developers.google.com/accounts/docs/OAuth2#serviceaccount
-[google-api-python-client]: https://code.google.com/p/google-api-python-client/wiki/OAuth2Client
-[GCS documentation]: https://developers.google.com/storage/docs/gspythonlibrary