[gnutls-devel] GnuTLS | sysrng-linux: re-open /dev/urandom every time (!1396)

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Alexander Sosedkin created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1396

Project:Branches: asosedkin/gnutls:oneshot-urandom to gnutls/gnutls:master
Author:    Alexander Sosedkin




Prompted by [the following comment](https://gitlab.com/gnutls/gnutls/-/merge_requests/1383#note_521749519) by @dueno:
> I also wonder why we keep the fd open for such a long time in the first
> place. Both OpenSSL and NSS have a similar fallback to /dev/urandom
> if getrandom is not available, but opens the device in one-shot,
> when reseeding is needed (and that's pretty rare).

I thought that could be easier to switch to such one-shot opening
than to resurrect and fix `tests/init_fds.c`.

I'm not exactly sure about all the benefits and drawbacks of going that way though,
so, please, treat that as a suggestion, not a request.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] 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)
 * [x] 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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