Log non actionable errors on WARN level

[hanzei]

Summary

Ticket Link

Fixes #352

[codecov]

Codecov Report

Base: 31.98% // Head: 32.00% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (a55cf68) compared to base (82c55a2).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #353      +/-   ##
==========================================
+ Coverage   31.98%   32.00%   +0.01%     
==========================================
  Files          21       21              
  Lines        3392     3390       -2     
==========================================
  Hits         1085     1085              
+ Misses       2198     2196       -2     
  Partials      109      109              

Impacted Files	Coverage Δ
server/api.go	23.82% <0.00%> (ø)
server/cluster.go	0.00% <ø> (ø)
server/command.go	23.92% <0.00%> (ø)
server/plugin.go	15.29% <0.00%> (ø)
server/subscriptions.go	47.20% <0.00%> (ø)
server/webhook.go	40.11% <0.00%> (ø)

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[blue40524]

server/command.go

[blue40524]

server/command.go

I approved