chore: use filepath.Join to get sock path

[ls0f]

No description provided.

[codecov]

Codecov Report

Merging #9395 (93c2960) into master (c026189) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #9395   +/-   ##
=======================================
  Coverage   45.77%   45.77%           
=======================================
  Files         220      220           
  Lines       26168    26168           
=======================================
  Hits        11979    11979           
  Misses      12531    12531           
  Partials     1658     1658           

Impacted Files	Coverage Δ
util/app/discovery/discovery.go	40.27% <0.00%> (ø)

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