Update st2tests fixtures

[Kami]

This pull request updates packs_base_path in the tests config to point to the st2tests/fixtures/ directory.

This way we can test resource loading and a lot of other things without needing to mock a bunch of stuff.

In addition to that, #1785 adds constraint that the entry point files needs to be located inside the pack. Before this change, a lot of tests violated this constraint causing failures and a lot of pain.

Note 1: This changes are cherry-pick from #1785 since I also need them in the RBAC branch.

Note 2: Eventually, I will move packs to st2tests/fixtures/packs/ directory, but now it's not that time :P

[Kami]

Yes, I know this is not the ideal name, but it's a smaller change which fixes the constraint violation mentioned in the PR description.

Eventually, we can move everything to st2tests/fixtures/packs/core/, but this requires more changes.

[lakshmi-kannan]

Eventually, I will move packs to st2tests/fixtures/packs/ directory, but now it's not that time :P

We already have packs in st2tests/resources/. This whole thing needs a rethought around organization.

[Kami]

Yeah, it's a bit all over the place now.

You are more than welcome to do the change :P

[manasdk]

I had hit a slight variation of this issue when dealing with registration of new content.

#techdebt at this point

[lakshmi-kannan]

Definitely not an ideal name executions.local but if this gets you unblocked, gfi.

[lakshmi-kannan]

You are more than welcome to do the change :P

Dude, I already did some cleanup moving inlined fixtures in test code to what we have right now. So I have high karma in this regard.

[manasdk]

+1

We will return to this cleanup some other day.