refactor: rename unused vars to underscores

[artek-koltun]

fixing a new golangci-lint check
unblocks #440

[codecov]

Codecov Report

Attention: 64 lines in your changes are missing coverage. Please review.

Comparison is base (86b40eb) 69.27% compared to head (8b4201c) 18.61%.

Files	Patch %	Lines
cmd/storage/test.go	0.00%	7 Missing ⚠️
cmd/network/evpn-bridge-port.go	0.00%	6 Missing ⚠️
cmd/storage/frontend/frontend.go	0.00%	6 Missing ⚠️
cmd/network/evpn-logical-brige.go	0.00%	5 Missing ⚠️
cmd/network/evpn-svi.go	0.00%	5 Missing ⚠️
cmd/network/evpn-vrf.go	0.00%	5 Missing ⚠️
cmd/storage/backend/backend.go	0.00%	4 Missing ⚠️
cmd/storage/backend/nvme_path.go	0.00%	4 Missing ⚠️
cmd/storage/frontend/nvme_controller.go	0.00%	4 Missing ⚠️
cmd/storage/storage.go	0.00%	3 Missing ⚠️
... and 9 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #441       +/-   ##
===========================================
- Coverage   69.27%   18.61%   -50.66%     
===========================================
  Files          18       62       +44     
  Lines        1393    10383     +8990     
===========================================
+ Hits          965     1933      +968     
- Misses        395     8191     +7796     
- Partials       33      259      +226     

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[sandersms]

LGTM