Remove EventListener implementation in DubboBootstrap

[kevinw66]

What is the purpose of the change

DubboBootstrap implements EventListener but there is no handle event method, maybe we should remove the implementation.

[codecov-commenter]

Codecov Report

Merging #7638 (6878861) into master (2057906) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #7638      +/-   ##
============================================
- Coverage     59.16%   59.09%   -0.08%     
+ Complexity      529      528       -1     
============================================
  Files          1076     1076              
  Lines         43435    43429       -6     
  Branches       6347     6347              
============================================
- Hits          25700    25666      -34     
- Misses        14904    14927      +23     
- Partials       2831     2836       +5     

Impacted Files	Coverage Δ	Complexity Δ
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	41.70% <ø> (-0.56%)	0.00 <0.00> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	82.75% <0.00%> (-13.80%)	0.00% <0.00%> (ø%)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0.00%> (-11.33%)	0.00% <0.00%> (ø%)
...a/org/apache/dubbo/event/GenericEventListener.java	88.88% <0.00%> (-5.56%)	0.00% <0.00%> (ø%)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0.00%> (-5.27%)	0.00% <0.00%> (ø%)
...dubbo/remoting/exchange/support/DefaultFuture.java	87.17% <0.00%> (-4.28%)	0.00% <0.00%> (ø%)
...he/dubbo/remoting/transport/netty/NettyServer.java	70.17% <0.00%> (-3.51%)	8.00% <0.00%> (-1.00%)
.../remoting/transport/netty4/NettyClientHandler.java	83.05% <0.00%> (-3.39%)	0.00% <0.00%> (ø%)
...exchange/support/header/HeaderExchangeHandler.java	66.37% <0.00%> (-2.66%)	0.00% <0.00%> (ø%)
...ting/exchange/support/header/HeartbeatHandler.java	90.69% <0.00%> (-2.33%)	0.00% <0.00%> (ø%)
... and 4 more

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[AlbumenJ]

LGTM.