Add test for ExecutionSegment.Scale consistency

[imiric]

This is a test from #1339, which did a bunch of things that are not needed anymore, so this is a cut-down version of that.

See #1296

[codecov-io]

Codecov Report

Merging #1374 into new-schedulers will decrease coverage by 0.01%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           new-schedulers    #1374      +/-   ##
==================================================
- Coverage           76.32%   76.30%   -0.02%     
==================================================
  Files                 161      161              
  Lines               12625    12625              
==================================================
- Hits                 9636     9634       -2     
- Misses               2479     2481       +2     
  Partials              510      510              

Impacted Files	Coverage Δ
lib/executor/vu_handle.go	94.28% <0.00%> (-2.86%)	⬇️

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[mstoykov]

My only nit is not a requirement

[mstoykov]

As I previously rebased these particular tests and used for testing the striping PR I can tell you that having values that are both smaller then the count of the segments and bigger is ... a good idea :D

I think that we can do something like:

1. get the number of segments(this is the first argument to generateRandomSequence
2. generate random numbers and run test for scale being smaller, equal and bigger to the count of segments.

[imiric]

Hhmm not sure what that would look like, but I'll think about it next time I touch these tests, thanks.