remove zk test in 1.5

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What this PR does:

Which issue(s) this PR fixes:

Fixes #

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Codecov Report

Merging #1363 (4b05547) into 1.5 (467c867) will decrease coverage by 2.55%.
The diff coverage is 63.02%.

❗ Current head 4b05547 differs from pull request most recent head cffc514. Consider uploading reports for the commit cffc514 to get more accurate results

@@            Coverage Diff             @@
##              1.5    #1363      +/-   ##
==========================================
- Coverage   58.07%   55.52%   -2.56%     
==========================================
  Files         275      276       +1     
  Lines       13381    15942    +2561     
==========================================
+ Hits         7771     8851    +1080     
- Misses       4650     6152    +1502     
+ Partials      960      939      -21     

Impacted Files	Coverage Δ
config/config_loader.go	43.40% <0.00%> (+4.56%)	⬆️
config/provider_config.go	62.06% <0.00%> (+7.52%)	⬆️
config/reference_config.go	80.00% <0.00%> (-1.67%)	⬇️
registry/zookeeper/listener.go	26.58% <0.00%> (-42.65%)	⬇️
remoting/zookeeper/listener.go	0.00% <0.00%> (-41.29%)	⬇️
config/config_center_config.go	66.21% <33.33%> (+2.03%)	⬆️
registry/directory/directory.go	77.89% <58.33%> (+2.14%)	⬆️
protocol/dubbo/dubbo_invoker.go	70.29% <60.00%> (+0.97%)	⬆️
filter/filter_impl/generic_filter.go	62.50% <65.38%> (-8.72%)	⬇️
protocol/grpc/server.go	77.14% <66.66%> (+3.80%)	⬆️
... and 291 more

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