python,python3: Fix CVE-2019-9740 and CVE-2019-9947

python,python3: Fix CVE-2019-9740 and CVE-2019-9947

These patches address issues:
CVE-2019-9740: Python urllib CRLF injection vulnerability
CVE-2019-9947: Header Injection in urllib

Links to Python issues:
https://bugs.python.org/issue36276 (resolved duplicated of 30458)
https://bugs.python.org/issue35906 (resolved duplicated of 30458)
https://bugs.python.org/issue30458

Issue 30458 is still currently open, waiting for a decision for
Python 3.5; these patches for Python 2.7 and 3.7 have been merged.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>