Imp: get local ip once and reused it

[cvictory]

As the title mentioned.

[codecov-io]

Codecov Report

Merging #808 into develop will increase coverage by 0.05%.
The diff coverage is 46.66%.

@@             Coverage Diff             @@
##           develop     #808      +/-   ##
===========================================
+ Coverage    59.92%   59.97%   +0.05%     
===========================================
  Files          259      260       +1     
  Lines        12752    12756       +4     
===========================================
+ Hits          7642     7651       +9     
+ Misses        4158     4149       -9     
- Partials       952      956       +4     

Impacted Files	Coverage Δ
cluster/cluster_impl/base_cluster_invoker.go	66.66% <0.00%> (ø)
config/config_loader.go	53.15% <0.00%> (ø)
config_center/configurator/override.go	72.22% <0.00%> (ø)
registry/consul/utils.go	67.50% <0.00%> (ø)
common/host_util.go	50.00% <50.00%> (ø)
cluster/cluster_impl/failover_cluster_invoker.go	70.00% <100.00%> (ø)
cluster/router/condition/router.go	78.91% <100.00%> (ø)
registry/directory/directory.go	74.01% <100.00%> (ø)
registry/kubernetes/registry.go	60.86% <100.00%> (ø)
registry/nacos/registry.go	50.74% <100.00%> (ø)
... and 5 more

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