Allow the __utils__ dunder in Grains modules

[mirceaulinic]

What does this PR do?

Allows having __utils__ in Grains modules.

Previous Behavior

Unable to use a custom utils module.

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[cachedout]

This makes a lot of sense. Thanks, @mirceaulinic

[max-arnold]

@mirceaulinic Hey! Are you going to backport this feature to master branch?

[mirceaulinic]

Hey @max-arnold. I'd be glad to port it, but I'm very surprised this code didn't make it given that's been merged a long time ago. My understanding is that it should have been included in 2019.2.0 at least, then 2019.2.1 as well, which is what SaltStack considers as stable. So now I'm just confused how on earth this is not there yet?

[max-arnold]

It was merged to neon but, after the test stabilization efforts in 2019.2.1, the neon branch isn't going to be released as is and instead all the PRs need to be ported to the master. See the new development policy and the porting tracking project:

• SEP 14 - Changes to branching and release strategy salt-enhancement-proposals#20
• https://github.com/saltstack/salt/projects/5#column-6831403

They explained this in more details during the office hours call on Oct 29, but I can't find the recording. Eventually they plan to port all the PRs from Neon on top of the new master branch, but I guess not everything will be ported on time for the next major release.

[max-arnold]

Ok, I went ahead and ported it: #55336