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Description of problem:
KeyUpdate messages interleaved with ApplicationData are not rejected by gnutls. 
This is a RFC 8446 section 5.1 violation:

   -  Handshake messages MUST NOT be interleaved with other record
      types.  That is, if a handshake message is split over two or more
      records, there MUST NOT be any other records between them.

Version-Release number of selected component (if applicable):
gnutls-3.6.5-2.el8.x86_64

How reproducible:
always

Steps to Reproduce:
1. run tlsfuzzer test-tls13-keyupdate.py test script against gnutls server

Actual results:
among failing tests there are
  '1/4 fragmented keyupdate msg, appdata between'
  '2/3 fragmented keyupdate msg, appdata between'
  '3/2 fragmented keyupdate msg, appdata between'
  '4/1 fragmented keyupdate msg, appdata between'

Expected results:
the above tests should not be listed as failing

Additional info:
there are also issues in handling split GET messages and multiple KeyUpdates in succession, but they are not directly related to this issue

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:3600