client: Disable service config query

By default, gRPC fetches TXT report while resolving a domain.
0914bba6c5/internal/resolver/dns/dns_resolver.go (L336)

This leads to a hanging dial if DNS is unavailable, even though the host
may be specified in `/etc/hosts` (hello, localhost!).

This setting seems impossible to override with `WithGRPCDialOpts()`,
but we do not use service config anyway.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

api/rpc/client/options.go

@@ -38,6 +38,7 @@ func (c *cfg) initDefault() {
 	c.rwTimeout = defaultRWTimeout
 	c.grpcDialOpts = []grpc.DialOption{
 		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithDisableServiceConfig(),
 	}
 }