Try to load the InCluster config first, if that fails load kubectl config

Janis Meybohmrequested to merge
jayme-github/gitlab-runner:try_incluster_config_first into master

What does this MR do?

Allows Kubernetes executor to use the in-cluster service account.

Why was this MR needed?

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?

#1717 (closed)

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