GH-496 GW target own cluster

[maksymvavilov]

From the original only 1 task is left that are covered here: validate Gateway CR when it arrives for the reconciliation loop and add a test for an invalid Gateway.

In this context invalid == has a mixture single- and multicluster addresses. We expect only one type of addresses to be present at the Gateway CR.

I'm also giving a second life to the traffic.Gateway transforming it into the utils.GatewayWrapper to preform the mentioned check. Keeping it separate from main packages for

• Simplicity of policy controllers departure
• Possibilities to use the wrapper in other packages without the fear of import cycles

closes #496

[mikenairn]

Few small comments/suggestions, but i think this is looking good. I'm not sure if utils will be the eventual home of the gateway wrapper but its fine for now, we can decide where it should live as it evolves (Closer alignment/merge with MultiClusterGatewayTarget).

[maksymvavilov]

Few small comments/suggestions, but i think this is looking good. I'm not sure if utils will be the eventual home of the gateway wrapper but its fine for now, we can decide where it should live as it evolves (Closer alignment/merge with MultiClusterGatewayTarget).

Would you have a better place/name in mind for the GatewayWrapper package? 🤔 don't like either of those but couldn't come up with a better place and name

[mikenairn]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: makslion, mikenairn

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [mikenairn]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment