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The QoS of retained messages should depend on subscribers (#288)

* Enhance retain test
broker not store zero-byte retained messages

* Send retained packets should incr broker.counter.

* clientSub.qos=0 should not be evaluated as false

* Retained messages delivery QoS should depend on subscribers
[MQTT-3.3.1-5] If the RETAIN flag is set to 1, in a PUBLISH Packet sent by a Client to a Server, the Server MUST store the Application Message and its QoS, so that it can be delivered to future subscribers whose subscriptions match its topic name
We store the retained message QoS in a persistence store. If the retain message is QoS 1
Sub (QoS 2) will get the msg in QoS 1
Sub (QoS 1) will get the msg in QoS 1
Sub (QoS 0) will get the msg in QoS 0 (downgraded)

* Refactored & standardized

* Added comment

* Fixed lint

* Fixed test that subscription happen after retained

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