[1.9.x] + fix the issue #610
https://github.com/AsyncHttpClient/async-http-client/issues/610
"Backport #525 to Grizzly provider"
Introduce Channels helper
minor clean up
Rename connectionsPool into channelPool
Only compute message parameters when debug is enabled
First perform final boolean check so block could be jitted away
Move pools to own package
Introduce ChannelManager
Move limits to ChannelManager
remove dead code
Don't store the provider in the future!!!
Registering after bootstrap.connect felt racy, moving to ConnectListener
minor clean up
Fix: release on connect failure
[1.9.x] fix issue #608
https://github.com/AsyncHttpClient/async-http-client/issues/608
"Grizzly provider can't deal with wss + proxy"
[1.9.x] + minor cleanup
Disable GrizzlyBodyDeferringAsyncHandlerTest for Grizzly, see #625
Rename methods
Remove NettyConnectListener.Builder
Move tryToOfferChannelToPool to ChannelManager