add ddagent stream collector#10

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Jimmy-Chuang wants to merge 4 commits intomasterfrom

Commits on Jan 24, 2018

first implementation of stream type collector
Jimmy Chuang
committed

Commits on Jan 25, 2018

ddagent port configuration
Jimmy Chuang
committed
support tag in ddagent metric
Jimmy Chuang
committed

Commits on Jan 26, 2018

Merge branch 'master' into init
Jimmy Chuang
committed