Generate correct HOST header when IPv6 with scope_id

[violetagg]

Related to #460

[codecov-io]

Codecov Report

Merging #462 into master will decrease coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #462      +/-   ##
============================================
- Coverage     62.99%   62.94%   -0.05%     
+ Complexity     1254     1253       -1     
============================================
  Files           122      122              
  Lines          5988     5981       -7     
  Branches        784      783       -1     
============================================
- Hits           3772     3765       -7     
  Misses         1790     1790              
  Partials        426      426

Impacted Files	Coverage Δ	Complexity Δ
...a/reactor/netty/http/client/HttpClientConnect.java	54.11% <100%> (+0.86%)	4 <0> (ø)	⬇️
src/main/java/reactor/netty/FutureMono.java	65% <0%> (-2.5%)	8% <0%> (ø)
...ctor/netty/resources/PooledConnectionProvider.java	78.07% <0%> (-1.16%)	19% <0%> (-1%)
...c/main/java/reactor/netty/channel/FluxReceive.java	78.75% <0%> (-0.52%)	60% <0%> (-1%)
...r/netty/http/server/WebsocketServerOperations.java	53.62% <0%> (+1.44%)	15% <0%> (+1%)	⬆️

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