Merge pull request Netflix#1843 from Netflix/nullaway

Add errorprone and nullaway analysis

Handle close_notify in ConnectionPoolHandler (Netflix#1841)

* Close on completion close event

* Add handling to OriginResponseReceiver

* Use a new status category

* Fix index

* Add unit test for ids being unique

* 504 is probably better than 500

* Switch to debug logging

* Use 502 for close_notify

wire new listener spec through channel deps

add a listener spec and wire for channelDeps

Add new retry policy adjustment method (Netflix#1824)

* Add new retry policy adjustment method for when we have a response object

* Fix test

* Actually fix test

* Break out to separate method

* Fix tests

Upgrade to Netty 4.1.113

Extract a method to allow easier injecting of custom shutdown behavior (

Netflix#1809)

Only start read timeout handler on success (Netflix#1793)

Upgrade to latest netty (Netflix#1789)

* Bump to latest netty

* genlock

Bump version