[Dubbo-AbstractConfig] Fix password be print in plain text

[FavorMylikes]

What is the purpose of the change

Hidden the important password information to avoid be printed in plain text into the logger file

Brief changelog

Update AbstractConfig.java
hidden password

Verifying this change

The registry[<dubbo:registry password="******" username="someone" timeout="10000" group="test" client="curator" address="127.0.0.1" protocol="zookeeper" port="2181" />] will be used as the config center, dubbo version: 2.7.8, current host: 127.0.0.1

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[FavorMylikes]

Issue is here
#6930

[codecov-io]

Codecov Report

Merging #6931 (f2c9c1f) into master (3fc2d10) will decrease coverage by 0.17%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #6931      +/-   ##
============================================
- Coverage     59.44%   59.26%   -0.18%     
+ Complexity      511      504       -7     
============================================
  Files          1028     1028              
  Lines         41519    41519              
  Branches       6037     6022      -15     
============================================
- Hits          24679    24605      -74     
- Misses        14104    14157      +53     
- Partials       2736     2757      +21     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/org/apache/dubbo/config/AbstractConfig.java	73.05% <0.00%> (-0.33%)	0.00 <0.00> (ø)
...rg/apache/dubbo/remoting/utils/PayloadDropper.java	15.38% <0.00%> (-30.77%)	0.00% <0.00%> (ø%)
...che/dubbo/remoting/transport/mina/MinaChannel.java	39.47% <0.00%> (-11.85%)	15.00% <0.00%> (-2.00%)
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	62.06% <0.00%> (-10.35%)	0.00% <0.00%> (ø%)
...o/remoting/transport/ChannelHandlerDispatcher.java	60.00% <0.00%> (-10.00%)	0.00% <0.00%> (ø%)
...e/dubbo/remoting/transport/netty/NettyChannel.java	51.13% <0.00%> (-9.10%)	18.00% <0.00%> (-3.00%)
.../registry/multicast/MulticastServiceDiscovery.java	23.07% <0.00%> (-7.70%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/all/AllChannelHandler.java	82.75% <0.00%> (-6.90%)	0.00% <0.00%> (ø%)
...he/dubbo/common/threadpool/ThreadlessExecutor.java	56.52% <0.00%> (-6.53%)	0.00% <0.00%> (ø%)
...mmon/threadpool/support/AbortPolicyWithReport.java	92.50% <0.00%> (-5.00%)	0.00% <0.00%> (ø%)
... and 28 more

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[horizonzy]

LGTM

[AlbumenJ]

LGTM.