Stabilize EtcdMetadataReportTest

[biyuhao]

What is the purpose of the change

both testStoreProvider() and testStoreConsumer() are unstable, and it is more likely failed in travis.
The assumption we made that the operation should be done in 1s in async mode may fail.

Brief changelog

Bring back testStoreProvider()
Use EtcdMetadataReport in sync mode for UT

Verifying this change

ut pass

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[codecov-io]

Codecov Report

Merging #5088 into master will increase coverage by 0.12%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #5088      +/-   ##
============================================
+ Coverage     63.89%   64.02%   +0.12%     
- Complexity      451      452       +1     
============================================
  Files           769      769              
  Lines         33261    33261              
  Branches       5235     5249      +14     
============================================
+ Hits          21252    21295      +43     
+ Misses         9571     9530      -41     
+ Partials       2438     2436       -2

Impacted Files	Coverage Δ	Complexity Δ
...e/dubbo/remoting/transport/netty/NettyChannel.java	52.27% <0%> (-3.41%)	19% <0%> (-1%)
...che/dubbo/common/compiler/support/JdkCompiler.java	64.54% <0%> (ø)	0% <0%> (ø)	⬇️
...org/apache/dubbo/registry/redis/RedisRegistry.java	48.15% <0%> (+0.28%)	31% <0%> (ø)	⬇️
...rg/apache/dubbo/common/timer/HashedWheelTimer.java	62.75% <0%> (+0.34%)	0% <0%> (ø)	⬇️
...g/apache/dubbo/registry/consul/ConsulRegistry.java	62.5% <0%> (+0.62%)	29% <0%> (ø)	⬇️
...org/apache/dubbo/config/context/ConfigManager.java	66.66% <0%> (+0.79%)	0% <0%> (ø)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	93.75% <0%> (+1.04%)	0% <0%> (ø)	⬇️
...ache/dubbo/common/compiler/support/ClassUtils.java	50.26% <0%> (+1.04%)	0% <0%> (ø)	⬇️
.../dubbo/remoting/transport/netty4/NettyChannel.java	64.77% <0%> (+1.13%)	0% <0%> (ø)	⬇️
.../apache/dubbo/remoting/etcd/jetcd/JEtcdClient.java	9.09% <0%> (+1.21%)	0% <0%> (ø)	⬇️
... and 14 more

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[CrazyHZM]

LGTM