Scorecard should use namespace from user's kubeconfig context

[joelanford]

Bug Report

What did you do?

1. Created a namespace called scorecard-test
2. Updated my ~/.kube/config file to make scorecard-test my current context namespace
3. Ran operator-sdk alpha scorecard ./internal/scorecard/alpha/testdata/bundle --skip-cleanup
4. Ran kubectl get pods

What did you expect to see?
I expected to see the scorecard pods in the scorecard-test namespace.

What did you see instead? Under which circumstances?
I found the scorecard pods in the default namespace.

Environment

• operator-sdk version:

operator-sdk version: "v0.19.0-17-g2594430b", commit: "2594430b796836fb2e1b1b79b5970beae5346a37", kubernetes version: "v1.18.2", go version: "go1.14.4 linux/amd64"

• go version:

go version go1.13.10 linux/amd64

• Kubernetes version information:

Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.5", GitCommit:"e6503f8d8f769ace2f338794c914a96fc335df0f", GitTreeState:"clean", BuildDate:"2020-06-26T03:47:41Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-04-16T11:48:36Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}

• Kubernetes cluster kind: minikube

• Are you writing your operator in ansible, helm, or go? N/A

Possible Solution
When loading the config, get the current context's namespace and use that as the default when --namespace is not defined.

Additional context
Add any other context about the problem here.