Cleanup error messages and provide consistency in error reporting

[mthenw]

No description provided.

[codecov-io]

Codecov Report

Merging #396 into master will decrease coverage by 0.03%.
The diff coverage is 26.31%.

@@            Coverage Diff             @@
##           master     #396      +/-   ##
==========================================
- Coverage   56.59%   56.55%   -0.04%     
==========================================
  Files          25       24       -1     
  Lines        1433     1434       +1     
==========================================
  Hits          811      811              
- Misses        576      577       +1     
  Partials       46       46

Impacted Files	Coverage Δ
httpapi/httpapi.go	35.19% <0%> (-0.6%)	⬇️
function/errors.go	0% <0%> (ø)	⬆️
providers/http/http.go	70% <50%> (ø)	⬆️
providers/awskinesis/awskinesis.go	50% <66.66%> (ø)	⬆️
providers/awslambda/awslambda.go	41.17% <66.66%> (ø)	⬆️

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[RaeesBhatti]

👍