config center support registry multi-address format

[chickenlj]

address="zookeeper://127.0.0.1:2181|zookeeper://127.0.0.1:2181"

[codecov-commenter]

Codecov Report

Merging #6209 into master will decrease coverage by 0.11%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #6209      +/-   ##
============================================
- Coverage     60.88%   60.76%   -0.12%     
+ Complexity      493      490       -3     
============================================
  Files           999      999              
  Lines         39898    39880      -18     
  Branches       5744     5720      -24     
============================================
- Hits          24292    24234      -58     
- Misses        12915    12950      +35     
- Partials       2691     2696       +5     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/org/apache/dubbo/config/RegistryConfig.java	85.49% <33.33%> (-2.11%)	0.00 <0.00> (ø)
...ache/dubbo/config/utils/ConfigValidationUtils.java	75.65% <50.00%> (-0.29%)	0.00 <0.00> (ø)
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	52.53% <60.00%> (-0.40%)	0.00 <0.00> (ø)
...rg/apache/dubbo/remoting/utils/PayloadDropper.java	15.38% <0.00%> (-30.77%)	0.00% <0.00%> (ø%)
...bo/config/event/listener/LoggingEventListener.java	37.50% <0.00%> (-25.00%)	0.00% <0.00%> (ø%)
...va/org/apache/dubbo/remoting/TimeoutException.java	0.00% <0.00%> (-22.23%)	0.00% <0.00%> (ø%)
...ava/org/apache/dubbo/config/DubboShutdownHook.java	63.82% <0.00%> (-10.64%)	0.00% <0.00%> (ø%)
...che/dubbo/remoting/transport/mina/MinaChannel.java	39.47% <0.00%> (-10.53%)	15.00% <0.00%> (-1.00%)
...mmon/threadpool/support/fixed/FixedThreadPool.java	80.00% <0.00%> (-7.50%)	0.00% <0.00%> (ø%)
...moting/transport/netty4/NettyEventLoopFactory.java	30.00% <0.00%> (-6.37%)	0.00% <0.00%> (ø%)
... and 39 more

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