Improve the Unit Test for conf package & HTTP Probe

[haoel]

• Fix Unit Test failed on Windows platform - Windows platform seems to leave the removed files a while, which could sometimes cause the unit test to fail.

• Add the UT for HTTP probe - test coverage to 100%

[codecov-commenter]

Codecov Report

Base: 99.33% // Head: 99.51% // Increases project coverage by +0.17% 🎉

Coverage data is based on head (4c0fa3f) compared to base (882a021).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #199      +/-   ##
==========================================
+ Coverage   99.33%   99.51%   +0.17%     
==========================================
  Files          48       49       +1     
  Lines        4085     4088       +3     
==========================================
+ Hits         4058     4068      +10     
+ Misses         16       12       -4     
+ Partials       11        8       -3     

Impacted Files	Coverage Δ
daemon/daemon_linux.go	100.00% <0.00%> (ø)
probe/http/http.go	100.00% <0.00%> (+3.41%)	⬆️

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