Delete unused/out-dated primitives

[seunghwak]

any_of_adj_matrix_row & transform_reduce_v_with_adj_matrix_row (graph primitives) were initially added to be used in error checking but they are no longer used (and may not be used in the future as well).

Deleting the dead code.

[codecov-commenter]

Codecov Report

Merging #1704 (ac381c9) into branch-21.08 (aba3445) will increase coverage by 0.02%.
The diff coverage is n/a.

❗ Current head ac381c9 differs from pull request most recent head 649dfed. Consider uploading reports for the commit 649dfed to get more accurate results

@@               Coverage Diff                @@
##           branch-21.08    #1704      +/-   ##
================================================
+ Coverage         59.31%   59.34%   +0.02%     
================================================
  Files                80       80              
  Lines              3557     3559       +2     
================================================
+ Hits               2110     2112       +2     
  Misses             1447     1447              

Impacted Files	Coverage Δ
python/cugraph/_version.py	44.80% <0.00%> (+0.39%)	⬆️

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[BradReesWork]

@gpucibot merge