v1: Switch from github.com/go-kit/kit to github.com/go-kit/log interfaces

[liggitt]

github.com/go-kit/kit split out just the logging interfaces to github.com/go-kit/log to allow downstreams to avoid inheriting large numbers of additional dependencies (made visible and impacting to go modules in v0.10.0 of github.com/go-kit/kit). xref prometheus/common#255

This switches to the slimmed down logging interface module to avoid a bump to go-kit/kit v0.10.0 picking up a ton of new dependencies

v2 version in #426

cc @dims

[codecov-commenter]

Codecov Report

Merging #426 (c685ed1) into master (6465c16) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #426   +/-   ##
=======================================
  Coverage   73.21%   73.21%           
=======================================
  Files          42       42           
  Lines        1370     1370           
=======================================
  Hits         1003     1003           
  Misses        306      306           
  Partials       61       61           

Impacted Files	Coverage Δ
logging/kit/client_interceptors.go	100.00% <ø> (ø)
logging/kit/ctxkit/context.go	0.00% <ø> (ø)
logging/kit/options.go	80.48% <ø> (ø)
logging/kit/payload_interceptors.go	78.57% <ø> (ø)
logging/kit/server_interceptors.go	100.00% <ø> (ø)

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[dims]

details go-kit/kit#1055 and prometheus/common#255

[liggitt]

cc @johanbrandhorst

[johanbrandhorst]

LGTM with a small nit

[liggitt]

done

[johanbrandhorst]

Thanks for your contribution!