Upgrade `spdy` to 4.x.x and support Node v6, v8, v10#373

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AdamMagaluk wants to merge 26 commits intomasterfrom spdy-upgrade

+294-142

Commits on Nov 30, 2017

First at upgrading [email protected] and [email protected]
AdamMagaluk
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Commits on Dec 3, 2017

Spdy/h2 ping working using forked version of spdy.
AdamMagaluk
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Commits on Feb 19, 2018

Add extra upgrade header data back to socket for spdy to parse
AdamMagaluk
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Commits on Apr 18, 2018

Fix virtual device subscription causing socket hang up
AdamMagaluk
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Commits on May 2, 2018

Commits on Nov 24, 2018

Updates to fix streams closing the connection.
AdamMagaluk
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Commits on Dec 4, 2018

Fix isssue with reconnects not passing proper connectionId to peer client.
AdamMagaluk
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Commits on Dec 13, 2018

Peer z2z transport always uses spdy/3.1 to support old zetta hubs.
AdamMagaluk
committed

Commits on Jul 15, 2020

Upgrade zetta-cluster to fix security vulnerabilities.

Adam Magaluk
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Adam Magaluk
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