axtls doesn't define all the CERT_xxx constants, nor the MBEDTLS_VERSION
constant.
This change means that `tls.SSLContext` is imported into the module, but
that's subsequently overridden by the class definition in this module.
Signed-off-by: Damien George <damien@micropython.org>
MicroPython now supplies SSL/TLS functionality in a new built-in `tls`
module. The `ssl` module is now implemented purely in Python, in this
repository. Other libraries are updated to work with this scheme.
Signed-off-by: Felix Dörre <felix@dogcraft.de>
Damien George