[DUBBO-3952]: Dubbo 2.7.1 ： delay export function doesn't work,

[beiwei30]

What is the purpose of the change

a follow up for #3957

Brief changelog

XXXXX

Verifying this change

XXXXX

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[ralf0131]

LGTM

[Leishunyu]

LGTM

[codecov-io]

Codecov Report

Merging #3959 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #3959      +/-   ##
============================================
+ Coverage     63.85%   63.88%   +0.03%     
  Complexity       98       98              
============================================
  Files           715      715              
  Lines         31498    31493       -5     
  Branches       5076     5074       -2     
============================================
+ Hits          20112    20120       +8     
+ Misses         9075     9066       -9     
+ Partials       2311     2307       -4

Impacted Files	Coverage Δ	Complexity Δ
...in/java/org/apache/dubbo/config/ServiceConfig.java	58.15% <100%> (-0.02%)	0 <0> (ø)
.../remoting/transport/netty4/NettyServerHandler.java	61.9% <0%> (-9.53%)	0% <0%> (ø)
...apache/dubbo/common/config/ConfigurationUtils.java	64% <0%> (-8%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	51.42% <0%> (-5.72%)	0% <0%> (ø)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0%> (-5.27%)	0% <0%> (ø)
...exchange/support/header/HeaderExchangeHandler.java	59.84% <0%> (-2.37%)	0% <0%> (ø)
...pache/dubbo/registry/support/AbstractRegistry.java	80.07% <0%> (+1.91%)	0% <0%> (ø)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	75.51% <0%> (+2.04%)	0% <0%> (ø)	⬇️
...ng/exchange/support/header/HeartbeatTimerTask.java	78.94% <0%> (+5.26%)	0% <0%> (ø)	⬇️
...ava/org/apache/dubbo/config/DubboShutdownHook.java	81.25% <0%> (+6.25%)	0% <0%> (ø)	⬇️
... and 2 more

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