docs: void dropNonPreferredConnections()
      {
          final String methodName = "dropNonPreferredConnections";
          if (TraceComponent.isAnyTracingEnabled() && TRACE.isEntryEnabled())
          {
              SibTr.entry(this, TRACE, methodName);
          }
  
          // If we are connected to a non preferred then we will NEVER be connect to a preferred as 
          // well, there is no mixing of connection types.
          if (!_connectedToPreferred)
          {
              closeConnections();
          }
  
          if (TraceComponent.isAnyTracingEnabled() && TRACE.isEntryEnabled())
          {
              SibTr.exit(TRACE, methodName);
          }
      }