[ISSUE] fix #4641 . Don't support metadata for generic service.

[cvictory]

fix #4641

Don't support metadata for generic service.

[codecov-io]

Codecov Report

Merging #4660 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #4660      +/-   ##
============================================
+ Coverage     63.91%   63.96%   +0.05%     
- Complexity      451      453       +2     
============================================
  Files           769      769              
  Lines         33141    33171      +30     
  Branches       5223     5230       +7     
============================================
+ Hits          21181    21219      +38     
+ Misses         9531     9527       -4     
+ Partials       2429     2425       -4

Impacted Files	Coverage Δ	Complexity Δ
...n/java/org/apache/dubbo/common/utils/UrlUtils.java	78.04% <ø> (ø)	0 <0> (ø)	⬇️
...bo/metadata/integration/MetadataReportService.java	81.63% <100%> (+3.58%)	0 <0> (ø)	⬇️
...apache/dubbo/common/config/ConfigurationUtils.java	64% <0%> (-8%)	0% <0%> (ø)
...he/dubbo/remoting/transport/netty/NettyServer.java	69.64% <0%> (-3.58%)	8% <0%> (-1%)
...he/dubbo/registry/multicast/MulticastRegistry.java	67.87% <0%> (-1.81%)	0% <0%> (ø)
...ache/dubbo/registry/multiple/MultipleRegistry.java	64.08% <0%> (+1.4%)	22% <0%> (+2%)	⬆️
...e/dubbo/remoting/transport/netty/NettyChannel.java	62.35% <0%> (+4.7%)	21% <0%> (+1%)	⬆️
...n/java/org/apache/dubbo/common/bytecode/Proxy.java	77.7% <0%> (+5.48%)	0% <0%> (ø)	⬇️
...onfig/spring/extension/SpringExtensionFactory.java	85.36% <0%> (+7.31%)	0% <0%> (ø)	⬇️
.../apache/dubbo/qos/protocol/QosProtocolWrapper.java	82.05% <0%> (+12.82%)	0% <0%> (ø)	⬇️

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