bpo-22021: shutil.make_archive() root_dir do not work

[nanjekyejoannah]

This PR fixes issue : https://bugs.python.org/issue22021.
Signed-off-by: nanjekyejoannah <nanjekyejoannah@gmail.com

https://bugs.python.org/issue22021

[the-knights-who-say-ni]

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[vstinner]

@nanjekyejoannah: Hum, it seems like test_shutil is failing. Can you try to investigate why it fails? (tell me if you need help)

[vstinner]

Can you please amend your commit message to mention the original author? Example:

Initial patch by Weinan Li. 

About your commit message:

This PR fixes issue : https://bugs.python.org/issue22021. Signed-off-by: nanjekyejoannah <nanjekyejoannah@gmail.com 

The first line is useless: the bpo number is already part of the commit title. On the second line, > is missing, no? By the way, I don't use such Git tag usually. What is its purpose?

[nanjekyejoannah]

@vstinner I sign the commits just incase it is a requirement as most projects I have opened PRs on require. I think am too used also :)

Review noted. I will revert with fixes for the same.

[serhiy-storchaka]

The current behavior looks correct to me. It is consistent with the behavior of the tar command. This change breaks tests and I think it will break user code.

Read the discussion on bpo-22021.