build: Lint install_requires in setup.py

[rzr]

While doing packaging works I noticed that
pypi file 'tuf.egg-info/requires.txt' was modified on build.

Let's sort dependencies alphabetically to avoid lint to change sources files.

Change-Id: I009810877681afe9b84a3c4f9bed14553327105b
Signed-off-by: Philippe Coval rzr@users.sf.net

Please fill in the fields below to submit a pull request. The more information
that is provided, the better.

Fixes #

Description of the changes being introduced by the pull request:

Please verify and check that the pull request fulfills the following
requirements:

• The code follows the Code Style Guidelines
• Tests have been added for the bug fix or new feature
• Docs have been added for the bug fix or new feature

[jku]

Sounds good to me but which linter is this? something debian build tooling runs automatically?

[rzr]

Yes "egg_info" does the linting and update the file.

I can explain how to replicate

git clone https://github.com/CrossStream/tuf 
cd tuf
git checkout -b upstream origin/upstream
git checkout -b debian/master origin/debian/master
uscan --download-current
gbp buildpackage
# (...)
# running install_egg_info
# running egg_info
# writing tuf.egg-info/PKG-INFO
# writing dependency_links to tuf.egg-info/dependency_links.txt
# writing requirements to tuf.egg-info/requires.txt
# (...)
git diff
diff --git a/tuf.egg-info/requires.txt b/tuf.egg-info/requires.txt
index 319b2b54..26ed815a 100644
--- a/tuf.egg-info/requires.txt
+++ b/tuf.egg-info/requires.txt
@@ -1,3 +1,3 @@
 requests>=2.19.1
-six>=1.11.0
 securesystemslib>=0.18.0
+six>=1.11.0

[joshuagl]

Thank you for the contribution @rzr

Change-Id: I009810877681afe9b84a3c4f9bed14553327105b

Could you remove this from your commit messages?