[gnutls-devel] GnuTLS | Fix FIPS integrity self tests (!873)

[Development of GNU's TLS library]

New Merge Request !873

https://gitlab.com/gnutls/gnutls/merge_requests/873

Project:Branches: ansasaki/gnutls:fix_fips_lib_name to gnutls/gnutls:master
Author:    Anderson Sasaki
Assignee:  


Add a description of the new feature/bug fix. Reference any relevant bugs.

This is a fix for a bug originally reported here: https://bugzilla.redhat.com/show_bug.cgi?id=1665061

There were 2 issues:
* The libraries names in libs/fips.c have not been updated when the sonames were bumped:
```
  libgnutls.so.28 -> libgnutls.so.30
  libnettle.so.4  -> libnettle.so.6
  libhogweed.so.2 -> libhogweed.so.4
```
* The decoding of the HMAC fails when there is a '\n' at the end of the file. The newline makes the file to hold 65 bytes instead of the expected 64 bytes. At the end of the processing (lib/extras/hex.c:39) it checks if all input bytes were processed, but the last remaining byte makes the check to fail. This is not exactly a bug, but allowing newlines at the end of the file makes the format of the accepted files more flexible, and the integrity check more robust.

## Checklist
 * [x] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## 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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