message: Fix test about DID for data from ledger.
diff: @@ -77,7 +77,11 @@ mod high_cases {
  let (did, verkey) = DidUtils::create_and_store_my_did(trustee_wallet_handle, None).unwrap();
  let nym_request = LedgerUtils::build_nym_request(&trustee_did, &did, Some(&verkey), None, None).unwrap();
  - LedgerUtils::sign_and_submit_request(pool_handle, trustee_wallet_handle, &trustee_did, &nym_request, None).unwrap();
  + let nym_resp = LedgerUtils::sign_and_submit_request(pool_handle, trustee_wallet_handle, &trustee_did, &nym_request, None).unwrap();
  +
  + let get_nym_request = LedgerUtils::build_get_nym_request(&did, &did).unwrap();
  + LedgerUtils::submit_request(pool_handle, &get_nym_request,
  + Some(LedgerUtils::extract_timestamp_from_reply(&nym_resp).unwrap())).unwrap();
  let received_verkey = DidUtils::key_for_did(pool_handle, wallet_handle, &did).unwrap();
  assert_eq!(verkey, received_verkey);
  @@ -338,7 +342,11 @@ mod high_cases {
  let attrib_request = LedgerUtils::build_attrib_request(&trustee_did, &trustee_did,
  None, Some(&attrib_data), None).unwrap();
  - LedgerUtils::sign_and_submit_request(pool_handle, wallet_handle, &trustee_did, &attrib_request, None).unwrap();
  + let attrib_req_resp = LedgerUtils::sign_and_submit_request(pool_handle, wallet_handle, &trustee_did, &attrib_request, None).unwrap();
  +
  + let get_attrib_req = LedgerUtils::build_get_attrib_request(&trustee_did, &trustee_did, "endpoint").unwrap();
  + LedgerUtils::submit_request(pool_handle, &get_attrib_req,
  + Some(LedgerUtils::extract_timestamp_from_reply(&attrib_req_resp).unwrap())).unwrap();
  let (endpoint, key) = DidUtils::get_endpoint_for_did(wallet_handle, pool_handle, &trustee_did).unwrap();
  assert_eq!(ENDPOINT, endpoint);
  