chore(linter): fix the golangci-lint errors

[ecrupper]

Addressed:

• nolint leading spacing issue
• gofmt ran on all files
• adding revive to the nolint directive in context_test.go
• adding a ReadHeaderTimeout to the server to protect against Slowloris attacks
• a few comments ending in lists that got cleaned up with gofmt
• removed the utc option in the logger code since its declared as true everywhere in the code and the editing of end inside that function was resulting in an unused variable linter error
• changing all usages of io/ioutil to be either io or os

[codecov]

Codecov Report

Merging #693 (a1caac5) into master (7e9cfa2) will decrease coverage by 0.00%.
The diff coverage is 64.28%.

@@            Coverage Diff             @@
##           master     #693      +/-   ##
==========================================
- Coverage   55.10%   55.09%   -0.01%     
==========================================
  Files         201      201              
  Lines       15960    15959       -1     
==========================================
- Hits         8794     8793       -1     
  Misses       6788     6788              
  Partials      378      378              

Impacted Files	Coverage Δ
api/build.go	1.64% <0.00%> (ø)
api/log.go	0.00% <ø> (ø)
api/metrics.go	0.00% <ø> (ø)
api/pagination.go	0.00% <ø> (ø)
api/repo.go	0.00% <ø> (ø)
api/service.go	0.00% <ø> (ø)
api/step.go	0.00% <ø> (ø)
api/stream.go	0.00% <ø> (ø)
api/webhook.go	0.00% <0.00%> (ø)
compiler/native/native.go	83.72% <ø> (ø)
... and 53 more