Implement Equals function using TestTags

[matthijswolters-rl]

It is mentioned in a comment in the code itself but because of the discrepency between the fields in the EndpointMonitor CR and the Statuscake API it is not immediately clear how to compare an old monitor with an updated monitor. The way I have elected to check this is to use the TestTags field to include some kind of identifier that should be updated on any change. So if the tags have changed then the monitor should be updated.

How to test:

1. run a local kubernetes cluster and set KUBECONFIG to the correct kubeconfig
2. run make install in repo dir
3. run the local docker registry docker run -d -p 5000:5000 --name registry registry:2
4. build the image and push it

• docker build -t localhost:5000/controller:latest .
• docker push localhost:5000/controller:latest

5. add the secret imc-config and test-secret and the endpoint monitor (ask me for the commands)
6. run make deploy
7. edit the deployment in ingressmonitorcontroller-system to use the image localhost:5000/controller:latest
8. kill the pod so it pulls the most recent version

[robinderooij-rl]

Impressed. Awesome!