Remove __future__ import.

[purple4reina]

What does this PR do?

Removes __future__ import.

Motivation

It is not needed anymore.

Testing Guidelines

I ran a before/after comparison. We see there's actually a very very slight cold start gain when removing the import.

Additional Notes

The __future__ imports allow you to optionally apply a new python feature which will be required in a future python version.

Looking at this chart https://docs.python.org/3/library/__future__.html#module-contents, we see that the absolute_import feature was added to python in v3.0. We can therefore remove this import because the feature is on by default anyway.

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog
• This PR passes the integration tests (ask a Datadog member to run the tests)