Add bind-dynamic to dnsmasq conf

[hjensas]

We should enable the bind-dynamic option to allow our DHCP server to co-exist with other DHCP services - such as one for a libvirt network.

Without this the service will fail to start if there is a livirt network with DHCP enabled.

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• 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

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[cjeanner]

@hjensas heya! I'd rather prefer if you could have a look at #1741 and collaborate with @rebtoor to improve that other PR if you don't mind? Thanks!

[hjensas]

Closing - this is addressed in #1741