
Base classes should define interface between driver and upper oslo messaging layer and shouldn't have fields and methods used for internal driver's purposes. 1) base listener: + prefetch_size attribute; -driver attribute 2) base incomingMessage: - reply method - listener attribute 3) base RpcIncomingMessage added - it is incomingMessage + reply method Change-Id: Ic2c0fce830763eb4e00f2cca789e9c1c6b5420ed