message: Add back compat for old loader
diff: @@ -42,6 +42,7 @@ import {
  TreeTreeEntry,
  } from "@microsoft/fluid-protocol-base";
  import {
  + ConnectionState,
  IChunkedOp,
  IClientDetails,
  IDocumentMessage,
  @@ -793,6 +794,13 @@ export class ContainerRuntime extends EventEmitter implements IContainerRuntime,
  return { snapshot, state };
  }
  + // Back-compat: <= 0.17
  + public changeConnectionState(state: ConnectionState, clientId?: string) {
  + if (state !== ConnectionState.Connecting) {
  + this.setConnectionState(state === ConnectionState.Connected, clientId);
  + }
  + }
  +
  public setConnectionState(connected: boolean, clientId?: string) {
  this.verifyNotClosed();
  