Revert "Add gsutil 4.13 to telemetry/third_party"

tools/telemetry/third_party/gsutil/third_party/python-gflags/README

Index: tools/telemetry/third_party/gsutil/third_party/python-gflags/README
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-This repository contains a python implementation of the Google commandline
-flags module.
-
- GFlags defines a *distributed* command line system, replacing systems like
- getopt(), optparse and manual argument processing. Rather than an application
- having to define all flags in or near main(), each python module defines flags
- that are useful to it.  When one python module imports another, it gains
- access to the other's flags.
-
- It includes the ability to define flag types (boolean, float, interger, list),
- autogeneration of help (in both human and machine readable format) and reading
- arguments from a file. It also includes the ability to automatically generate
- man pages from the help flags.
-
-Documentation for implementation is at the top of gflags.py file.
-
-To install the python module, run
-   python ./setup.py install
-
-When you install this library, you also get a helper application,
-gflags2man.py, installed into /usr/local/bin.  You can run gflags2man.py to
-create an instant man page, with all the commandline flags and their docs, for
-any C++ or python program you've written using the gflags library.