net/py-kafka-python: Update to 1.4.1

Changelogs:
https://github.com/dpkp/kafka-python/releases/tag/1.4.1 (and similar URLs)

Additional port changes:

• MASTER_SITES changed to the upstream github URL due to failure to download from CHEESESHOP.
• Reordered the USES section.
• Removed USES=shebangfix since it makes no difference.
• Updated WWW with new github account.

PR: 223989
Submitted by: Sergey Akhmatov <sergey@akhmatov.ru>
Approved by: christer.edwards@gmail.com (maintainer), tcberner (mentor, implicit)