dnsmasq - Enable Router Advertisements if v6 range

[hjensas]

Add a check in a networks 'ranges' - if 'start_v6' is defined in any range add 'enable-ra' to the dnsmasq config.

As a pull request owner and reviewers, I checked that:

• Appropriate testing is done and actually running
• Appropriate documentation exists and/or is up-to-date:
  • README in the role
  • Content of the docs/source is reflecting the changes

[github-actions]

Thanks for the PR! ❤️
I'm marking it as a draft, once your happy with it merging and the PR is passing CI, click the "Ready for review" button below.

[hjensas]

Looks good:
https://logserver.rdoproject.org/39/1839/17276fa4682e07716707cf86f4a7358421520f2a/github-check/cifmw-molecule-dnsmasq/468fa4d/ci-framework-data/artifacts/startrek.conf

[cjeanner]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cjeanner

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [cjeanner]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment