implement some best practices

[jmazzitelli]

fixes kiali/kiali#4485

[jmazzitelli]

this first commit provides the ability to add custom labels to the Ingress/Route. It also fixes a bug I found in the Route annotations.

[jmazzitelli]

second commit sets the resource requests on the operator. We might also consider setting resource limits, but so far that is not implemented.

[jmazzitelli]

third commit sets the resource requests on the server. We might also consider setting resource limits, but so far that is not implemented.

[jmazzitelli]

fourth commit adds memory limits to the server pod. We are going to opt not to create memory limits for the operator pod right now

[jmazzitelli]

to test - install via the server helm chart and set the helm value deployment.ingress.additional_labels.foo=bar and (if on non-OpenShift/minikube/kind) set deployment.ingress.enabled=true. When you install, check that the Ingress has the label "foo: bar" and check the server pod's container to ensure it has resources defaults:

resources:
  requests:
    cpu: 10m
    memory: 64Mi
  limits;
    memory: 1Gi

If you test on OpenShift, check that the labels are on the Route (a Route is created on OpenShift, not an Ingress).

Then test by installing the operator via its helm chart and make sure it's pod container also has resources defaults:

resources:
  requests:
    cpu: 10m
    memory: 64Mi