Bring back netgroups support

Samuel Cabrerorequested to merge
samba-team/devel/samba:scabrero-netgroups into master

The netgroups support was dropped together with NIS support, but there are still legit use cases where netgroups can be used without NIS infrastructure.

This MR brings them back after a discussion in samba technical [1].

[1] https://lists.samba.org/archive/samba-technical/2022-June/137419.html

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • (optional) This MR is just one part towards a larger feature.
  • (optional, if backport required) Bugzilla bug filed and BUG: tag added
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated
  • CI timeout is 3h or higher (see Settings/CICD/General pipelines/ Timeout)

Reviewer's checklist:

  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to README.Coding.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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