fix metadata config does not take effect

[chickenlj]

fixes #5742

[codecov-io]

Codecov Report

Merging #5809 into master will decrease coverage by 0.15%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master    #5809      +/-   ##
============================================
- Coverage     61.38%   61.23%   -0.16%     
- Complexity      495      496       +1     
============================================
  Files           979      982       +3     
  Lines         38893    39123     +230     
  Branches       5606     5639      +33     
============================================
+ Hits          23876    23957      +81     
- Misses        12392    12530     +138     
- Partials       2625     2636      +11

Impacted Files	Coverage Δ	Complexity Δ
.../java/org/apache/dubbo/config/ReferenceConfig.java	69% <33.33%> (-0.55%)	0 <0> (ø)
...in/java/org/apache/dubbo/config/ServiceConfig.java	62.46% <33.33%> (-0.28%)	0 <0> (ø)
...org/apache/dubbo/rpc/service/GenericException.java	0% <0%> (-37.5%)	0% <0%> (ø)
...rc/main/java/org/apache/dubbo/rpc/AppResponse.java	55.07% <0%> (-12.93%)	0% <0%> (ø)
...va/org/apache/dubbo/remoting/TimeoutException.java	22.22% <0%> (-11.12%)	0% <0%> (ø)
.../main/java/org/apache/dubbo/rpc/RpcInvocation.java	63.35% <0%> (-10.7%)	0% <0%> (ø)
...main/java/org/apache/dubbo/rpc/AsyncRpcResult.java	48.51% <0%> (-6.44%)	0% <0%> (ø)
...mmon/threadpool/support/AbortPolicyWithReport.java	83.78% <0%> (-5.41%)	0% <0%> (ø)
...ng/exchange/support/header/HeartbeatTimerTask.java	73.68% <0%> (-5.27%)	0% <0%> (ø)
...dubbo/remoting/exchange/support/DefaultFuture.java	79.31% <0%> (-3.58%)	0% <0%> (ø)
... and 34 more

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