Initialize the gate client on CRUD

[KeisukeYamashita]

WHAT

As title. Lazy client initialize.

WHY

In initial Armory's Spinnaker Terraform Provider implementation, it depends on the spinnaker/spin.

• providerConfigFunc →

  terraform-provider-spinnaker/spinnaker/provider.go

  Line 63 in d4c224f

  func providerConfigureFunc(data *schema.ResourceData) (interface{}, error) {

If the tfstate has Spinnaker resource, on terraform plan, terraform will initialize the gateclient. However, on the initialize, the spin will try to access the the Spinnaker API.

• NewGateClient → https://github.com/spinnaker/spin/blob/b08b4209beee7cf6ebb006d029c0a97fb1ae5a87/cmd/gateclient/client.go#L99-L195
• the line the spin will access Spinnaker API on client inilization → https://github.com/spinnaker/spin/blob/b08b4209beee7cf6ebb006d029c0a97fb1ae5a87/cmd/gateclient/client.go#L188

If the provider can't access the Spinnaker API on terraform init that is okay.
We should avoid the CI to fail when we change the lab Spinnaker authn method.

[KeisukeYamashita]

No, this is not needed.