Cleanup Services interfaces

[mthenw]

No description provided.

[codecov]

Codecov Report

Merging #469 into master will not change coverage.
The diff coverage is 91.66%.

@@          Coverage Diff           @@
##           master    #469   +/-   ##
======================================
  Coverage    68.5%   68.5%           
======================================
  Files          34      34           
  Lines        2137    2137           
======================================
  Hits         1464    1464           
  Misses        612     612           
  Partials       61      61

Impacted Files	Coverage Δ
libkv/cors.go	88.88% <100%> (ø)	⬆️
libkv/subscription.go	88.6% <100%> (ø)	⬆️
libkv/eventtype.go	85.71% <100%> (ø)	⬆️
libkv/function.go	84.81% <100%> (ø)	⬆️
httpapi/httpapi.go	79.75% <80%> (ø)	⬆️

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