message: Fix name variable on poolRestartRequestJson
diff: NSError *ret = [[LedgerUtils sharedInstance] buildPoolRestartRequestWithSubmitterDid:identifier
  action:@"start"
  schedule:@"{}"
  - resultJson:&poolUpgradeRequestJson];
  + resultJson:&poolRestartRequestJson];
  XCTAssertEqual(ret.code, Success, @"LedgerUtils::buildPoolRestartRequestWithSubmitterDid() failed");
  XCTAssertNotNil(poolRestartRequestJson, @"poolRestartRequestJson is nil!");
  NSLog(@"poolRestartRequestJson: %@", poolRestartRequestJson);
  