Add SO_KEEPALIVE option for upstream connections.#614

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JonathanO wants to merge 6 commits intoenvoyproxy:masterfrom

JonathanO:add-tcp-keepalive-option

Commits on Apr 9, 2018

Add SO_KEEPALIVE option for upstream connections.
JonathanO
committed

Commits on Apr 10, 2018

Commits on Apr 11, 2018

Commits on Apr 13, 2018

Remove support for bootstrap config of keepalive
JonathanO
committed