Terminating gateway service2

[Oluwalogoye]

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Changes proposed in this PR:

• Create a crd for registering external services to consul. Its aim is to replace the first two manual components here. Read full details in RFC

How I've tested this PR:

• go test ./... -run <unit test function name>

How I expect reviewers to test this PR:

• go test ./... -run TestReconcileCreateTerminatingGatewayService
• go test ./... -run TestReconcile_DeleteTerminatingGatewayService

CHANGELOG

• Created a new CRD with operator-sdk create api --group consul --version v1alpha1 --kind TerminatingGatewayService --controller --namespaced=true --make=false --resource=true
• Made changes to the reconcile function of TerminatingGatewayService to register the services
• Added tests in terminatinggatewayservice_test.go
• Ran make ctrl-generate, make-ctrl-manifests

Checklist:

• [ ] Tests added
• [ ] CHANGELOG entry added

  HashiCorp engineers only, community PRs should not add a changelog entry. Entries should use present tense (e.g. Add support for...)

[hashicorp-cla]

All committers have signed the CLA.

[manobi]

That would help with the troublesome implementation I have setup with Terraform and consul provider.

[ndhanushkodi]

Great work on this Logo-- this looks great, and we'll just hold off on merging until we finish reviewing the RFC design