unify config config items: qos.enable to qos-enable.

[chickenlj]

What is the purpose of the change

fixes #3958

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #4095 into master will increase coverage by 0.11%.
The diff coverage is 33.33%.

@@             Coverage Diff              @@
##             master    #4095      +/-   ##
============================================
+ Coverage     62.66%   62.77%   +0.11%     
- Complexity      473      474       +1     
============================================
  Files           763      766       +3     
  Lines         32845    32897      +52     
  Branches       5182     5189       +7     
============================================
+ Hits          20582    20652      +70     
+ Misses         9894     9858      -36     
- Partials       2369     2387      +18

Impacted Files	Coverage Δ	Complexity Δ
...ava/org/apache/dubbo/config/ApplicationConfig.java	91.3% <33.33%> (-6.29%)	0 <0> (ø)
...ubbo/metadata/store/redis/RedisMetadataReport.java	52.94% <0%> (-47.06%)	6% <0%> (+1%)
.../org/apache/dubbo/rpc/filter/CompatibleFilter.java	60% <0%> (-23.34%)	0% <0%> (ø)
...rg/apache/dubbo/rpc/filter/ExecuteLimitFilter.java	76.19% <0%> (-10.48%)	0% <0%> (ø)
...apache/dubbo/rpc/protocol/dubbo/FutureAdapter.java	56% <0%> (-8.52%)	0% <0%> (ø)
.../src/main/java/org/apache/dubbo/rpc/RpcStatus.java	63.73% <0%> (-6.6%)	0% <0%> (ø)
...rc/main/java/com/alibaba/dubbo/rpc/Invocation.java	28.57% <0%> (-4.77%)	0% <0%> (ø)
...e/dubbo/remoting/transport/netty/NettyChannel.java	57.64% <0%> (-4.71%)	20% <0%> (-1%)
...rg/apache/dubbo/monitor/support/MonitorFilter.java	71.42% <0%> (-4.44%)	0% <0%> (ø)
.../org/apache/dubbo/config/MetadataReportConfig.java	88.09% <0%> (-4.22%)	0% <0%> (ø)
... and 63 more

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[Moriadry-zz]

There are some conflicts in your pr.

[cvictory]

LGTM. @mercyblitz have reviewed this pr.