[gnutls-devel] GnuTLS | Improve 0-RTT handling in gnutls-serv/gnutls-cli (!1936)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1936

Project:Branches: dueno/gnutls:wip/dueno/nst-extensions to gnutls/gnutls:master
Author:   Daiki Ueno




<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

* tests: add basic tests for 0-RTT with gnutls-serv and gnutls-cli

* cli: preserve negotiated max_early_data_size across resumption

* serv: fix detection of early data reception

Upon success, gnutls_record_recv_early_data returns the amount of data
received, so the application should treat positive numbers as an
indication of early data reception.

* gnutls_record_set_max_early_data_size: make it callable from client

Since commit 9a7ce5a74cbef069394f677c0c79af2c876546db,
max_early_data_size is initialized as 0 on the client side, and set
only after receiving NewSessionTicket. There are, however, no ways to
preserve the max_early_data_size value across multiple calls to
gnutls_init. This patch allows the client to set the negotiated
max_early_data_size in the second session, through
gnutls_record_set_max_early_data_size.

Fixes: #1664 

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [x] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] 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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