lxd/network/openvswitch/ovn: Updates LogicalSwitchPortSetDNS to return the DNS UUID record ID
lxd/network/openvswitch/ovn: Updates LogicalSwitchPortSetDNS to return the DNS UUID record ID

Uses for for reverting a record created when LogicalSwitchPortSetDNS is updated to only accept DNS UUID.

Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

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