Add 'tags' to Templates

[donovanmuller]

Use the new category tags for OpenShift templates to categorise the Data Flow templates.

See https://docs.openshift.org/latest/dev_guide/templates.html#writing-description

[donovanmuller]

For example, using:

apiVersion: v1
kind: Template
metadata:
  name: "spring-cloud-dataflow-server-openshift-ephemeral-kafka"
  annotations:
    openshift.io/display-name: "Spring Cloud Data Flow Server for OpenShift with ephemeral datasources and Kafka Template"
    description: |-
      A Spring Cloud Data Flow Server for OpenShift template.
      This template deploys the Data Flow Server, an ephemeral MySQL container, an ephemeral Redis container and a Kafka environment.
      These resources sare configured by means of the ConfigMap.
    iconClass: "icon-spring"
    tags: "integration,spring-cloud"
...