g3-icap-client: allow to connect to a unix socket address

[zh-jq]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 57.14286% with 9 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@1d6273b). Learn more about missing BASE report.
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/g3-icap-client/src/service/connection.rs	64.28%	5 Missing ⚠️
lib/g3-icap-client/src/service/config/yaml.rs	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #853   +/-   ##
=========================================
  Coverage          ?   58.31%           
=========================================
  Files             ?     1381           
  Lines             ?   125401           
  Branches          ?        0           
=========================================
  Hits              ?    73128           
  Misses            ?    52273           
  Partials          ?        0           

Flag	Coverage Δ
g3keymess	21.10% <ø> (?)
g3mkcert	27.34% <ø> (?)
g3proxy	49.24% <57.14%> (?)
g3statsd	5.59% <ø> (?)
lib	41.37% <0.00%> (?)

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