Remove dependency in testify/mock in non-test code

[nopcoder]

dbscan/mock_startScannerFunc.go include reference to github.com/stretchr/testify/mock, by renaming the filename to mock_test.go the code will be include just for testing and remove the code and package from final binary.

[codecov[bot]]

Codecov Report

Merging #70 (d45ad83) into master (4f3a1ff) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #70   +/-   ##
=======================================
  Coverage   87.59%   87.59%           
=======================================
  Files           5        5           
  Lines         282      282           
=======================================
  Hits          247      247           
  Misses         29       29           
  Partials        6        6           

Flag	Coverage Δ
unittests	87.59% <ø> (ø)

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