[gnutls-devel] GnuTLS | improve gnutls-cli-debug testing of old SSL 3.0 servers (!1221)

[Development of GNU's TLS library]

Daniel Lenski created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1221

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



As far as I can tell, SSL 3.0 as described in [RFC6101](https://tools.ietf.org/html/rfc6101) *does not* require any support for TLS extensions.

This MR modifies `gnutls-cli-debug` to test servers for SSL 3.0 without extensions, and without including any newer-than-SSL 3.0 ciphersuites, before testing _with_ extensions enabled, and _with_ newer-than-SSL 3.0 ciphersuites enabled.

This prevents `gnutls-cli-debug` from incorrectly reporting a lack of SSL 3.0 support in some very old, but seemingly standards-compliant, servers. (See #958 for an example.)

# 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
 * [x] 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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