Saving websocket RTT samples#234

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darkk wants to merge 7 commits intom-lab:mainfrom

censoredplanet:l7-ping-pt2

Commits on Jan 20, 2020

ndt7: measure and report L7 RTT based on websocket ping
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Commits on Jan 21, 2020

Commits on Jan 24, 2020

ndt7: wrap websocket ping into json to protect against unsolicited pong frames
darkk
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Commits on Jan 28, 2020

ndt7: implement /ping handler as a self-contained module
darkk
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Commits on Jan 30, 2020

ndt7: add comments on the initial ping frame
darkk
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Commits on Feb 4, 2020

Fix typo
darkk
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