Fix: Nacos client logDir path seperator

[AlbumenJ]

What this PR does:

• fix logDir path seperator in Windows
• fix unit test prepare script for Windows

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:
no

[codecov-commenter]

Codecov Report

Merging #591 into develop will increase coverage by 0.48%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #591      +/-   ##
===========================================
+ Coverage    66.80%   67.29%   +0.48%     
===========================================
  Files          185      188       +3     
  Lines         9749     9854     +105     
===========================================
+ Hits          6513     6631     +118     
+ Misses        2600     2574      -26     
- Partials       636      649      +13     

Impacted Files	Coverage Δ
config/config_center_config.go	73.33% <100.00%> (+1.90%)	⬆️
config_center/nacos/client.go	75.42% <100.00%> (+19.86%)	⬆️
cluster/cluster_impl/base_cluster_invoker.go	61.11% <0.00%> (-11.36%)	⬇️
cluster/directory/base_directory.go	56.81% <0.00%> (-9.10%)	⬇️
protocol/dubbo/listener.go	57.52% <0.00%> (-5.38%)	⬇️
protocol/dubbo/pool.go	76.81% <0.00%> (-4.55%)	⬇️
protocol/dubbo/client.go	67.87% <0.00%> (-1.22%)	⬇️
cluster/cluster_impl/failover_cluster_invoker.go	71.15% <0.00%> (-1.19%)	⬇️
cluster/cluster_impl/forking_cluster_invoker.go	58.33% <0.00%> (-0.21%)	⬇️
remoting/kubernetes/listener.go	52.83% <0.00%> (ø)
... and 22 more

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