Remove empty test

[yurishkuro]

Packages with main() don't need these files. Also refresh gopkg.lock

[codecov]

Codecov Report

Merging #1517 into master will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1517      +/-   ##
==========================================
+ Coverage    98.6%   98.77%   +0.17%     
==========================================
  Files         190      189       -1     
  Lines        9004     8986      -18     
==========================================
- Hits         8878     8876       -2     
+ Misses        102       86      -16     
  Partials       24       24

Impacted Files	Coverage Δ
...lugin/sampling/strategystore/adaptive/processor.go	99.21% <0%> (-0.79%)	⬇️
examples/memstore-plugin/main.go

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