[gnutls-devel] GnuTLS | gnutls_priority_set: do not override the priority after handshake is complete (!777)

[Development of GNU's TLS library]

New Merge Request !777

https://gitlab.com/gnutls/gnutls/merge_requests/777

Branches: tmp-fix-priority-set 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


When an application would re-set priorities prior to a rehandshake we would override the negotiated version with the highest supported, something which may lead to issues. See:
https://bugzilla.redhat.com/show_bug.cgi?id=1634736

## Checklist
 * [x] Code modified for feature
 * [ ] Test suite updated with functionality tests (test rehandshake over TLS1.2 when priorities are set with TLS1.3)

## 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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