HTTP API kickoff client

[winlinvip]

@see #406

[winlinvip]

Provide API to support kicking off the stream.

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[winlinvip]

Usage instructions, refer to WIKI:
https://github.com/simple-rtmp-server/srs/wiki/v2_CN_Security#kickoff-client
https://github.com/simple-rtmp-server/srs/wiki/v2_EN_Security#kickoff-client

https://github.com/simple-rtmp-server/srs/wiki/v2_CN_HTTPApi#kickoff-client
https://github.com/simple-rtmp-server/srs/wiki/v2_EN_HTTPApi#kickoff-client

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[winlinvip]

Actually, the client for live streaming should be deleted.

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[winlinvip]

This is the API for nginx, which is quite limited: https://github.com/arut/nginx-rtmp-module/wiki/Getting-number-of-subscribers
This is the kickoff/drop feature for nginx: https://github.com/arut/nginx-rtmp-module/wiki/Control-module. You can refer to the bug I submitted: #459.

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[chaclus]

If it is a cluster, how can we kickoff the publish client? Each node in the cluster may have the same client_id.

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