fix RedisMetadataReport cluster password is null

[xiaoheng1]

What is the purpose of the change

fix RedisMetadataReport cluster password is null and refactor code.

see more detail from #6715

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #7474 (45dde0b) into master (576b3ab) will decrease coverage by 0.09%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #7474      +/-   ##
============================================
- Coverage     59.12%   59.02%   -0.10%     
- Complexity      456      502      +46     
============================================
  Files          1043     1079      +36     
  Lines         42516    43329     +813     
  Branches       6226     6317      +91     
============================================
+ Hits          25136    25574     +438     
- Misses        14593    14912     +319     
- Partials       2787     2843      +56     

Impacted Files	Coverage Δ	Complexity Δ
...ubbo/metadata/store/redis/RedisMetadataReport.java	24.35% <50.00%> (+0.98%)	5.00 <0.00> (ø)
...a/org/apache/dubbo/rpc/filter/AccessLogFilter.java	26.86% <0.00%> (-52.24%)	0.00% <0.00%> (ø%)
...va/org/apache/dubbo/rpc/support/AccessLogData.java	53.16% <0.00%> (-37.98%)	0.00% <0.00%> (ø%)
.../cluster/configurator/parser/model/ConfigItem.java	48.00% <0.00%> (-24.00%)	0.00% <0.00%> (ø%)
...dubbo/common/status/support/LoadStatusChecker.java	46.15% <0.00%> (-15.39%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/WrappedChannelHandler.java	43.47% <0.00%> (-15.22%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/all/AllChannelHandler.java	68.96% <0.00%> (-13.80%)	0.00% <0.00%> (ø%)
...ing/context/DubboBootstrapApplicationListener.java	89.47% <0.00%> (-10.53%)	0.00% <0.00%> (ø%)
...che/dubbo/remoting/transport/mina/MinaChannel.java	35.52% <0.00%> (-10.53%)	14.00% <0.00%> (-1.00%)
.../apache/dubbo/rpc/protocol/AsyncToSyncInvoker.java	62.06% <0.00%> (-10.35%)	0.00% <0.00%> (ø%)
... and 101 more

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[AlbumenJ]

LGMT.