Allow url modification for minio

Allow full customization of VirtualService host, labels, annotations, and destination service parameters within the virtualservice configuration matching that of other packages (monitoring/eck/twistlock).

istio:
  enabled: false
  minio:
    # Toogle vs creation
    enabled: true
    annotations: {}
    labels: {}
    gateways:
      - istio-system/main
    hosts:
      - minio.{{ .Values.hostname }}
    service: ""
    port: ""
    namespace: ""