Unable to specify DNS authority

[toothbrush]

Good day!

I was attempting to specify which DNS server to use to resolve the hostname of my kiam-server, as follows:

/kiam agent \
    --server-address=dns://172.16.128.10/kiam-server.auth-system.svc.cluster.local:7443 [...more flags]

I expected this to be possible based on gRPC documentation here: https://github.com/grpc/grpc/blob/master/doc/naming.md

However, if i understand correctly, as a result of this line of code, forcibly prepending dns:/// to my server address:

kiam/pkg/server/gateway_builder.go

Line 133 in 80172c4

conn, err := grpc.DialContext(ctx, "dns:///"+b.address, dialOpts...)

..that capability is clobbered and as a user, i am unable to specify such things as a custom DNS authority, or even multiple comma-delimited IP addresses. Could you please comment as to whether that's intentional, or whether i could submit a PR simply removing the dns:/// prepended? Thank you!