[Dubbo-4556] fix dubbo startup is slow

[crossoverJie]

What is the purpose of the change

fix #4556

Brief changelog

modify:dubbo/dubbo-config/dubbo-config-api/src/main/java/org/apache/dubbo/config/ServiceConfig.java

[codecov-io]

Codecov Report

Merging #4601 into master will increase coverage by 0.11%.
The diff coverage is 58.84%.

@@             Coverage Diff              @@
##             master    #4601      +/-   ##
============================================
+ Coverage     64.11%   64.22%   +0.11%     
  Complexity      452      452              
============================================
  Files           768      768              
  Lines         32874    32891      +17     
  Branches       5180     5183       +3     
============================================
+ Hits          21077    21125      +48     
+ Misses         9379     9346      -33     
- Partials       2418     2420       +2

Impacted Files	Coverage Δ	Complexity Δ
...in/java/org/apache/dubbo/config/ServiceConfig.java	58.84% <58.84%> (+0.42%)	0 <0> (ø)	⬇️
...g/apache/dubbo/registry/consul/ConsulRegistry.java	61.87% <0%> (-0.63%)	29% <0%> (ø)
...exchange/support/header/HeaderExchangeHandler.java	67.21% <0%> (+2.45%)	0% <0%> (ø)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	81.6% <0%> (+3.06%)	0% <0%> (ø)	⬇️
...onfig/spring/extension/SpringExtensionFactory.java	85.36% <0%> (+4.87%)	0% <0%> (ø)	⬇️
.../org/apache/dubbo/remoting/ExecutionException.java	21.05% <0%> (+5.26%)	0% <0%> (ø)	⬇️
...ng/exchange/support/header/HeartbeatTimerTask.java	78.94% <0%> (+5.26%)	0% <0%> (ø)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	57.14% <0%> (+5.71%)	0% <0%> (ø)	⬇️
.../remoting/transport/netty4/NettyClientHandler.java	68.42% <0%> (+7.01%)	0% <0%> (ø)	⬇️
.../remoting/transport/netty4/NettyServerHandler.java	71.42% <0%> (+9.52%)	0% <0%> (ø)	⬇️
... and 2 more

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[crossoverJie]

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