code: public MockRouteTable deleteRouteTable(final String routetableId) {
  
          if (routetableId != null && allMockRouteTables.containsKey(routetableId)) {
              return allMockRouteTables.remove(routetableId);
          }
          return null;
      }
docs: Delete RouteTable.
  
  @param routetableId
  RouteTableId to be deleted
  @return Mock RouteTable.