Vhost support using multiple TLS certificates (#2270)

* Initial support for using multiple SSL certificates.

* Also list IP address subjectAltNames on log.

* Use Python 3.7+ way of specifying TLSv1.2 as the minimum version. Linter fixes.

* isort

* Cleanup, store server name for later use. Add RSA ciphers. Log rejected SNIs.

* Cleanup, linter.

* Alter the order of initial log messages and handling. In particular, enable debug mode early so that debug messages during init can be shown.

* Store server name (SNI) to conn_info.

* Update test with new error message.

* Refactor for readability.

* Cleanup

* Replace old expired test cert with new ones and a script for regenerating them as needed.

* Refactor TLS tests to a separate file.

* Add cryptography to dev deps for rebuilding TLS certs.

* Minor adjustment to messages.

* Tests added for new TLS code.

* Find the correct log row before testing for message. The order was different on CI.

* More log message order fixup. The tests do not account for the logo being printed first.

* Another attempt at log message indexing fixup.

* Major TLS refactoring.

CertSelector now allows dicts and SSLContext within its list.
Server names are stored even when no list is used.
SSLContext.sanic now contains a dict with any setting passed and information extracted from cert.
That information is available on request.conn_info.cert.
Type annotations added.
More tests incl. a handler for faking hostname in tests.

* Remove a problematic logger test that apparently was not adding any coverage or value to anything.

* Revert accidental commit of uvloop disable.

* Typing fixes / refactoring.

* Additional test for cert selection. Certs recreated without DNS:localhost on sanic.example cert.

* Add tests for single certificate path shorthand and SNI information.

* Move TLS dict processing to CertSimple, make the names field optional and use names from the cert if absent.

* Sanic CLI options --tls and --tls-strict-host to use the new features.

* SSL argument typing updated

* Use ValueError for internal message passing to avoid CertificateError's odd message formatting.

* Linter

* Test CLI TLS options.

* Maybe the right codeclimate option now...

* Improved TLS argument help, removed support for combining --cert/--key with --tls.

* Removed support for strict checking without any certs, black forced fscked up formatting.

* Update CLI tests for stricter TLS options.

Co-authored-by: L. Karkkainen <tronic@users.noreply.github.com>
Co-authored-by: Adam Hopkins <admhpkns@gmail.com>

tests/certs/sanic.example/fullchain.pem

@@ -0,0 +1,21 @@
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+-----END CERTIFICATE-----

tests/certs/sanic.example/privkey.pem

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEAzNeC95zB5LRybz9Wl16+Q4kbOLgXlyUQVKhg9OZD1ChN3T4Y
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+-----END RSA PRIVATE KEY-----