refactor(docker): use the single authenticated grpc transport

Signed-off-by: Drew Newberry <anewberry@nvidia.com>

Author: drew

crates/openshell-driver-docker/src/isolation.rs

@@ -64,7 +64,6 @@ impl DockerBoundarySpec {
                     socket_path: self.listener_socket,
                     tls: self.sandbox_tls,
                 },
-                multiplexed: true,
                 resource_claims: resource_claims.clone(),
                 resource_claim_files: BTreeMap::new(),
                 workload_identity: self.workload_identity.clone(),
@@ -80,7 +79,6 @@ impl DockerBoundarySpec {
                     socket_path: self.control_socket,
                     tls: self.supervisor_tls,
                 },
-                multiplexed: true,
                 host_gateway_ip: self.host_gateway_ip,
                 resource_claims,
                 driver_fence,