fix #525 HttpServer CONFIGURED moved to HttpTrafficHandler/Http2StreamBridgeHandler

[violetagg]

doOnConnection is invoked when HttpServer reaches state CONFIGURED.
On that state the user can add new handlers to the channel pipeline, because
of that the state's change must happen before ChannelOperationsHandler,
otherwise the new handlers will miss the first channelRead event.

[codecov-io]

Codecov Report

Merging #526 into master will increase coverage by 0.06%.
The diff coverage is 72.72%.

@@             Coverage Diff              @@
##             master     #526      +/-   ##
============================================
+ Coverage     63.54%   63.61%   +0.06%     
- Complexity     1306     1308       +2     
============================================
  Files           125      125              
  Lines          6285     6286       +1     
  Branches        836      836              
============================================
+ Hits           3994     3999       +5     
+ Misses         1849     1847       -2     
+ Partials        442      440       -2

Impacted Files	Coverage Δ	Complexity Δ
...eactor/netty/http/server/HttpServerOperations.java	70.72% <ø> (+0.31%)	61 <0> (ø)	⬇️
.../reactor/netty/http/server/HttpToH2Operations.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...or/netty/http/server/Http2StreamBridgeHandler.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../reactor/netty/http/server/HttpTrafficHandler.java	81.04% <100%> (+0.25%)	44 <0> (ø)	⬇️
...eactor/netty/channel/ChannelOperationsHandler.java	69.57% <0%> (+0.67%)	64% <0%> (+2%)	⬆️

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