fix #581 Add ConnectionProvider#disposeAllLater which closes active and inactive connections

[violetagg]

For active connections, this will shutdown the EventExecutorGroup,
the default quietPeriod and timeout will be used as
specified by EventExecutorGroup#shutdownGracefully()

[codecov-io]

Codecov Report

Merging #584 into master will increase coverage by 0.22%.
The diff coverage is 83.33%.

@@             Coverage Diff              @@
##             master     #584      +/-   ##
============================================
+ Coverage     64.29%   64.52%   +0.22%     
- Complexity     1332     1343      +11     
============================================
  Files           126      126              
  Lines          6361     6379      +18     
  Branches        849      852       +3     
============================================
+ Hits           4090     4116      +26     
+ Misses         1818     1810       -8     
  Partials        453      453

Impacted Files	Coverage Δ	Complexity Δ
...va/reactor/netty/resources/ConnectionProvider.java	50% <0%> (-2.39%)	7 <0> (ø)
...ctor/netty/resources/PooledConnectionProvider.java	78.77% <88.23%> (+0.61%)	23 <3> (+3)	⬆️
...eactor/netty/channel/ChannelOperationsHandler.java	70.26% <0%> (-0.89%)	64% <0%> (+2%)
...a/reactor/netty/http/client/HttpClientConnect.java	54% <0%> (+0.29%)	4% <0%> (ø)	⬇️
...java/reactor/netty/http/server/HttpServerBind.java	38.36% <0%> (+0.43%)	21% <0%> (+1%)	⬆️
...eactor/netty/http/server/HttpServerOperations.java	70.85% <0%> (+0.44%)	61% <0%> (ø)	⬇️
...eactor/netty/http/client/HttpClientOperations.java	54.04% <0%> (+0.86%)	66% <0%> (+1%)	⬆️
src/main/java/reactor/netty/tcp/TcpServer.java	51.38% <0%> (+2.77%)	23% <0%> (+2%)	⬆️
...rc/main/java/reactor/netty/tcp/TcpServerRunOn.java	92.85% <0%> (+50%)	4% <0%> (+2%)	⬆️

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[smaldini]

What happens if we close an event loop group shared by another component (server or client).

[violetagg]

Closing this in favour of the fix for #586 in particular channelGroup