[gnutls-devel] GnuTLS | refine tests for ancient servers which support both SSL 3.0 and TLS 1.0, but both only with %NO_EXTENSIONS (!1251)

[Development of GNU's TLS library]

Daniel Lenski created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1251

Project:Branches: dlenski/gnutls:better_SSL3.0_tests to gnutls/gnutls:master
Author:    Daniel Lenski



This is a follow-up to !1221.
    
See #958 and https://gitlab.com/openconnect/openconnect/-/issues/145 for a
real-world example of ancient Cisco servers with these deficiencies.
    
With !1221 only, gnutls-cli-debug reports that these ancient servers only support
SSL 3.0 (but without extensions).

With this additional change, gnutls-cli-debug correctly reports that such a
server also supports TLS 1.0 (but again with extensions disabled), and also reports
correctly the supported ciphers.

Unfortunately, these insecure and non-standards compliant servers remain in-use in
the real world, and it's helpful to understand the priority strings needed to support
them, especially for VPNs where there is often no alternative.

## Checklist
 * [X] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [X] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [X] 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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