add tests for Flickr(8|30)k datasets

[pmeier]

No description provided.

[codecov]

Codecov Report

Merging #3489 (db7f0ce) into master (afc502b) will increase coverage by 0.54%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3489      +/-   ##
==========================================
+ Coverage   78.75%   79.30%   +0.54%     
==========================================
  Files         105      105              
  Lines        9750     9711      -39     
  Branches     1566     1555      -11     
==========================================
+ Hits         7679     7701      +22     
+ Misses       1581     1518      -63     
- Partials      490      492       +2     

Impacted Files	Coverage Δ
torchvision/ops/boxes.py	87.77% <0.00%> (-3.49%)	⬇️
torchvision/transforms/functional_tensor.py	79.19% <0.00%> (-0.73%)	⬇️
torchvision/transforms/functional_pil.py	67.61% <0.00%> (-0.52%)	⬇️
torchvision/transforms/transforms.py	84.28% <0.00%> (-0.03%)	⬇️
torchvision/transforms/functional.py	81.77% <0.00%> (ø)
torchvision/datasets/utils.py	72.58% <0.00%> (+2.37%)	⬆️
torchvision/datasets/flickr.py	98.71% <0.00%> (+73.07%)	⬆️

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[fmassa]

Looks great, thanks!