[gnutls-devel] GnuTLS | handshake: check TLS version against modified server priorities (!1309)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1309

Branches: tmp-tls12-version-checks to master
Author:    Daiki Ueno



The server needs to take into account of multiple factors when
determining the TLS protocol version actually being used:
- the legacy version
- "supported_versions" extension
- user_hello_func that may modify the server's priorities

Only after that it can check whether the TLS version is enabled in the
server's priorities.

Fixes #1054.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [x] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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