[gnutls-devel] GnuTLS | dtls: recover when a NewSessionTicket message is lost (!741)

[Development of GNU's TLS library]

New Merge Request !741

https://gitlab.com/gnutls/gnutls/merge_requests/741

Branches: tmp-new-session-ticket-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


When the server's NewSessionTicket gets lost while the ChangeCipherSpec goes through, the client did not request retransmission by retransmitting his last flight, and the handshake was blocked. This commit addresses the issue and adds a reproducer.

## 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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