feat: get default host instead of 127.0.0.1

[sysulq]

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[codecov-commenter]

Codecov Report

Merging #731 (5f889cc) into master (cbd423b) will increase coverage by 0.12%.
The diff coverage is 66.66%.

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@@            Coverage Diff             @@
##           master     #731      +/-   ##
==========================================
+ Coverage   53.59%   53.72%   +0.12%     
==========================================
  Files         196      196              
  Lines       10831    10837       +6     
==========================================
+ Hits         5805     5822      +17     
+ Misses       4579     4569      -10     
+ Partials      447      446       -1     

Impacted Files	Coverage Δ
pkg/server/init.go	64.28% <66.66%> (+1.78%)	⬆️
pkg/registry/etcdv3/registry.go	72.26% <0.00%> (+1.02%)	⬆️
pkg/executor/xxl/task.go	69.64% <0.00%> (+2.67%)	⬆️
pkg/util/xnet/ip.go	15.21% <0.00%> (+15.21%)	⬆️

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