python-tornado: bump to version 5.0.2

python-tornado: bump to version 5.0.2

Tornado got a requirement on the SSL module in version 5.0.2
which is also checked in the setup.py script before installing.
Since the check in buildroot runs against the host-python which
is built without SSL support, these checks fail.

Adding OpenSSL support to host-python does not make sense since the
Python on the target will be a different one. Instead, remove the
checks (which, according to the source code comments essentially check
for Python >= 2.7.9 / Python3 >= 3.4 which is true for current
Buildroot) and select the SSL option of Python/Python3 when Tornado is
selected.

Signed-off-by: Jan Dohl <polygon@wh2.tu-dresden.de>
[Thomas: adjust commit title, convert patch to a Git formatted one.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>