Kiali Populate Tracing/Grafana Links

Adds population of the proper links based on the user's environment for Jaeger/Grafana.

• Uses dig to attempt to get any overrides to the full VS address (i.e. gets the first value from .Values.jaeger.values.istio.jaeger.hosts)
• Defaults to tracing/grafana.{{ .Values.hostname }}

Tested both with Helm templating and actual deployments, validated that this works and should accept the same value that will be populated to the Jaeger/Grafana VS.

Closes #596 (closed)

Closes #588 (closed)