* get_certificate - Add support of SNI
For python versions supporting `create_default_context` support SNI by using low-level
SSLContext.wrap_socket().getpeercert().
Add also more information in the error message
fixes#69
* Make sure default CA certificates are not loaded when ca_cert is specified.
* Refactor to combine common code.
* Update changelogs/fragments/get_certificate-add_support_for_SNI.yml
Co-authored-by: Felix Fontein <felix@fontein.de>
Co-authored-by: Felix Fontein <felix@fontein.de>