Multiple groups in a provider

[Tansito]

Summary

This PR enables to have more than one group managing the resources of a provider. The idea is that more than one group could update a function if it would be needed.

This is needed due to that right now how we don't have a fully working workflow to enable that a provider publish a function so we need to give permissions to ourselves too to do it.

Details and comments

To accomplish this use case we basically did the next steps:

• Removed admin_group field from Provider
• Added admin_groups field to the Provider as a M2M relationship
• Changed the current logic to support the change

[akihikokuroda]

LGTM. Would you add example of the structure of user, groups and provider? I assume there are user for consumer, provider and admin and groups for function admins and function user for each function.

[Tansito]

What do you have in mind, @akihikokuroda ? Some kind of diagram? I can prepare it monday an update it to the PR

[akihikokuroda]

Yeah, a diagram is great.thanks

[Tansito]

Something like this would be what are you looking for, @akihikokuroda ?

[akihikokuroda]

@Tansito It's a little different. What I want is probably an instance diagram that has some example user, provider and groups.

[Tansito]

I'm going to wait for #1406 before merge this. I think it's easier to migrate the logic from this PR to admin_groups than for the other one.

[Tansito]

Initially is ready for review but Monday I will give it a last review just in case I missed any reference.