psconfig Grafana building template uses wrong field name for bulding DNS tests graphs

[szymontrocha]

This template: https://github.com/perfsonar/psconfig/blob/5.1.0/psconfig/perfsonar-psconfig/templates/dns.json.j2

• uses the following query to build visualization: test.type.keyword: dns AND test.spec.nameserver.keyword: $dns_nameserver AND test.spec.host.keyword: $dns_host. It points to non-existing field. It should be:
  test.type.keyword: dns AND test.spec.query.keyword: $dns_nameserver AND test.spec.host.keyword: $dns_host
• variable definition dns_nameserver for bulding this visualization uses the same wrong field while it should be "field":"test.spec.query.keyword"

For both reasons this Dasbord fails to present data

[szymontrocha]

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