[ISSUE #999]support admin topicList and groupList method

[Slideee]

What is the purpose of the change

#999

Brief changelog

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Verifying this change

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[francisoliverlee]

实现最好和java保持一致。

1. 方法名GroupList 对应 getAllSubscriptionGroupadmin；TopicList 对应 fetchAllTopicList
2. 通信层返回的RemotingCommand，admin这一层的返回值建议做成明确的struct

[francisoliverlee]

实现最好和java保持一致。

1. 方法名GroupList 对应 getAllSubscriptionGroupadmin；TopicList 对应 fetchAllTopicList
2. 通信层返回的RemotingCommand，admin这一层的返回值建议做成明确的struct

[Slideee]

done.

[francisoliverlee]

LOGT