[WIP] Changes required in cuML corresponding to RAFT RNG improvements

[vinaydes]

This PR lists changes needed in cuML corresponding to RAFT RNG improvements PR #434.

[cjnolet]

rerun tests

[vinaydes]

The nearest neighbour test failure seems to be unrelated to this PR or the RAFT RNG PR. As is noted in the comments inside the test, this test seems to fail intermittently. Link to the issue #4262
Two observations I made so far

• The test seems to pass when alternate seed is used.
• In this line, the values in rbc_d seems to change between pass and fail scenario of the test.
  I'll investigate a little more on it.

[cjnolet]

@vinaydes, it looks like we have a tolerance of 1 mismatched element but it's failing w/ 2. I'm okay increasing that tolerance to 2 for the time being.

[cjnolet]

rerun tests

[cjnolet]

LGTM

[cjnolet]

@gpucibot merge

[vinaydes]

Thanks, Corey. I'll update the bug related to failing unit test with my findings so far for any future debugging effort.

[codecov-commenter]

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[cjnolet]

rerun tests