Add explicit bind exception

[smaldini]

Remove unused code

Fix for #368

[codecov-io]

Codecov Report

Merging #398 into master will increase coverage by 0.09%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master     #398      +/-   ##
============================================
+ Coverage     64.06%   64.15%   +0.09%     
- Complexity     1201     1204       +3     
============================================
  Files           117      118       +1     
  Lines          5610     5619       +9     
  Branches        732      734       +2     
============================================
+ Hits           3594     3605      +11     
+ Misses         1616     1612       -4     
- Partials        400      402       +2

Impacted Files	Coverage Δ	Complexity Δ
...tor/netty/http/server/HttpServerConfiguration.java	94.33% <ø> (-0.11%)	16 <0> (ø)
src/main/java/reactor/netty/tcp/TcpServerBind.java	86.51% <100%> (+4.29%)	11 <0> (ø)	⬇️
...reactor/netty/resources/NewConnectionProvider.java	70% <50%> (+4.24%)	7 <0> (ø)	⬇️
.../main/java/reactor/netty/ChannelBindException.java	64.28% <64.28%> (ø)	4 <4> (?)
...eactor/netty/http/server/HttpServerOperations.java	67.5% <0%> (-0.5%)	57% <0%> (-1%)

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