change resize interpolation default mode to nearest

[edgarriba]

What does this PR do?

use nearest interpolation method in resize by default to avoid artifacts in the data

nearest

blinear

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[codecov]

Codecov Report

Merging #352 (7edac33) into master (2da2328) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #352   +/-   ##
=======================================
  Coverage   88.82%   88.82%           
=======================================
  Files          80       80           
  Lines        4143     4143           
=======================================
  Hits         3680     3680           
  Misses        463      463           

Flag	Coverage Δ
unittests	88.82% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flash/image/segmentation/transforms.py	100.00% <ø> (ø)

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[ethanwharris]

Covered by #351