Added uninstall target which uninstalls libcugraph and cugraph from a prior build/install step

[rlratzel]

Added uninstall target which uninstalls libcugraph and cugraph from a prior build/install step. Also extended the clean target to remove inplace artifacts (mainly cython-generated cpp files and inplace .so python extensions built from cython).

NOTE: since targets can be combined on the same command, a user can get the "scrub" behavior by running:

./build.sh uninstall clean

[dantegd]

@rlratzel FYI: we do this cleaning as part of CI at least since 0.14 https://github.com/rapidsai/cuml/blob/branch-0.20/python/setup.py#L70 and it hasn't affected anything, I would recommend making this behavior just part of the clean target (just my 2 cents)

[rlratzel]

@rlratzel FYI: we do this cleaning as part of CI at least since 0.14 https://github.com/rapidsai/cuml/blob/branch-0.20/python/setup.py#L70 and it hasn't affected anything, I would recommend making this behavior just part of the clean target (just my 2 cents)

Thank you @dantegd - I'll just make scrub the default clean behavior then since that simplifies things.

[rlratzel]

@dantegd I decided I didn't feel comfortable uninstalling during a clean, so I made the uninstall steps a separate target but added the more thorough cleaning (inplace artifacts) part of the default clean like cuML.

[ChuckHastings]

This feels like it would have addressed the docker issue that @jnke2016 had today. I like the idea.

[codecov-commenter]

Codecov Report

Merging #1601 (572f6c5) into branch-0.20 (250f2c8) will decrease coverage by 1.13%.
The diff coverage is 62.80%.

❗ Current head 572f6c5 differs from pull request most recent head d29caa4. Consider uploading reports for the commit d29caa4 to get more accurate results

@@               Coverage Diff               @@
##           branch-0.20    #1601      +/-   ##
===============================================
- Coverage        61.04%   59.90%   -1.14%     
===============================================
  Files               73       79       +6     
  Lines             3219     3482     +263     
===============================================
+ Hits              1965     2086     +121     
- Misses            1254     1396     +142     

Impacted Files	Coverage Δ
python/cugraph/__init__.py	100.00% <ø> (ø)
python/cugraph/components/connectivity.py	95.65% <ø> (ø)
python/cugraph/dask/centrality/katz_centrality.py	29.16% <ø> (ø)
python/cugraph/dask/link_analysis/pagerank.py	21.87% <0.00%> (ø)
python/cugraph/dask/traversal/bfs.py	25.00% <0.00%> (-2.59%)	⬇️
python/cugraph/traversal/ms_bfs.py	11.11% <ø> (ø)
...ure/graph_implementation/simpleDistributedGraph.py	22.72% <22.72%> (ø)
python/cugraph/generators/rmat.py	34.44% <34.44%> (ø)
python/cugraph/linear_assignment/lap.py	71.42% <50.00%> (-10.39%)	⬇️
python/cugraph/structure/number_map.py	66.79% <57.14%> (+2.97%)	⬆️
... and 41 more

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[BradReesWork]

@gpucibot merge