message: Remove trace messages from client
diff: @@ -164,20 +164,13 @@ export class DeltaManager extends EventEmitter implements runtime.IDeltaManager
  * Submits a new delta operation
  */
  public submit(type: string, contents: any): number {
  - // Start adding trace for the op.
  - const traces: runtime.ITrace[] = [
  - {
  - action: "start",
  - service: this.clientType,
  - timestamp: now(),
  - }];
  // tslint:disable:no-increment-decrement
  const message: runtime.IDocumentMessage = {
  clientSequenceNumber: ++this.clientSequenceNumber,
  contents,
  referenceSequenceNumber: this.baseSequenceNumber,
  - traces,
  + traces: undefined,
  type,
  };
  this.readonly = false;
  @@ -408,13 +401,6 @@ export class DeltaManager extends EventEmitter implements runtime.IDeltaManager
  // TODO handle error cases, NACK, etc...
  const context = await this.handler.prepare(message);
  - // Add final ack trace.
  - message.traces.push({
  - action: "end",
  - service: this.clientType,
  - timestamp: now(),
  - });
  -
  // Watch the minimum sequence number and be ready to update as needed
  this.minSequenceNumber = message.minimumSequenceNumber;
  this.baseSequenceNumber = message.sequenceNumber;
  