[gnutls-devel] GnuTLS | Ensure we are sending the right protocol version on second client hello (!724)

[Development of GNU's TLS library]

New Merge Request !724

https://gitlab.com/gnutls/gnutls/merge_requests/724

Branches: tmp-hrr-protov-fix to master
Author:    Nikos Mavrogiannopoulos
Assignee:  
Approvers: Simon Josefsson, Dmitry Eremin-Solenikov, Hubert Kario, Tim Rühsen, Andreas Metzler, Daiki Ueno, Tom, Ander Juaristi, Tomáš Mráz, Anderson Sasaki and GnuTLS devel mailing list


That is, when we respond to a Hello Retry Request as client, we put the TLS1.2 version on the second client hello to send a hello that is as close as possible to the original hello. That effectively separates the handling of TLS1.2 rehandshake and TLS1.3 hello retry request when sending a client hello.
    
Resolves #535

## Checklist
 * [x] Code modified for feature
 * [x] Test suite updated with functionality tests

## 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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