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separate DNS domains via dhcp in multi-tenant Juno

Is there a way to set a separate DNS domain via dnsmasq for each tenant, instead of using the default "openstacklocal" in the /etc/resolv.conf for all? The nameserver attribute can be overridden with neutron subnet-update, however it seems there is no way to specify the DNS search domain from the cli or Horizon.

I'm using Juno with neutron networking, with multiple tenants and subnets. Each tenant has internal DNS server with dedicated zone. I'm hoping to get dnsmasq to serve something like: vm1.tenant1.com for the 1st tenant, vm1.tenant2.com for the 2nd, etc.