Ensure server will send a response in case websocket upgrade failure

[violetagg]

Fix for #269

[codecov-io]

Codecov Report

Merging #268 into master will decrease coverage by 0.41%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #268      +/-   ##
============================================
- Coverage     67.75%   67.33%   -0.42%     
+ Complexity     1008     1002       -6     
============================================
  Files            73       73              
  Lines          4258     4259       +1     
  Branches        604      605       +1     
============================================
- Hits           2885     2868      -17     
- Misses         1011     1024      +13     
- Partials        362      367       +5

Impacted Files	Coverage Δ	Complexity Δ
...or/ipc/netty/http/server/HttpServerOperations.java	68.45% <0%> (-0.41%)	47 <0> (+1)
...ctor/ipc/netty/resources/DefaultPoolResources.java	74.64% <0%> (-4.23%)	8% <0%> (-1%)
src/main/java/reactor/ipc/netty/FutureMono.java	81.63% <0%> (-4.09%)	4% <0%> (-1%)
...a/reactor/ipc/netty/channel/ChannelOperations.java	81.95% <0%> (-3.01%)	47% <0%> (-2%)
...java/reactor/ipc/netty/channel/ContextHandler.java	71.56% <0%> (-2.95%)	26% <0%> (-1%)
.../ipc/netty/channel/PooledClientContextHandler.java	58.53% <0%> (-1.63%)	24% <0%> (-1%)
...or/ipc/netty/http/client/HttpClientOperations.java	54.17% <0%> (-1.62%)	71% <0%> (-2%)
.../ipc/netty/http/client/MonoHttpClientResponse.java	82.19% <0%> (+4.1%)	6% <0%> (ø)	⬇️

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