update all dependencies

[aecay]

the background to this change is that we are preparing to update feed to the networking/v1 Ingress API (from the extensions/v1beta1 API that was previously used, and is now deprecated/removed from recent versions of k8s). in order to accomplish this, we need to update the k8s api libraries to more recent versions. this is a good opportunity to rebaseline our dependencies and shed support for a deprecated module (merlin) within feed. the next version of feed (incorporating the API change) will need to be a major version update, so we can batch these changes with the upcoming ones as well.

• update go version to 1.18
  • compiler 1.18 is required to build the newest sigs.k8s.io/yaml module
  • go.mod format 1.17 is required because of Error parsing go.mod module declares its path as: github.com/google/gnostic but was required as: github.com/googleapis/gnostic google/gnostic#262
• use go get -d -u ./... to pull in the newest version of all dependencies
• delete the merlin module
  • its test suite relied on calling proto.Clone which does some reflect tricks with private fields that no longer work correctly
  • anyway, merlin is EOL so we don't need to keep supporting it
• update our usage of the k8s apis
  • pass a context to the functions that demand one
  • comply with the new update apis (passing a name of the filed manager)
  • write some new deep-equal functions for a type (LoadBalancerIngress) that has fields (slices) in it now that are not comparable by simple ==
• update the k8s test suite to match
  • use autogenerated mocks for the parts that were touched by this update, to make it easier to keep up with future updates
• update ginkgo to v2
  • this catches an issue in the gorb tests with a misplaced Before/AfterSuite invocation

[howardburgess]

LGTM. Would be good to add a CHANGELOG entry.

[pyoio]

LGTM, decomm all the things!

[aecay]

Good shout re the changelog. If it's ok with you, I will do a third PR to prep the changelog and bump the version, after the two open ones are merged in?

[howardburgess]

Sounds fine to me!