[scikit-learn] DBScan freezes my computer !!!

[Joel Nothman]

Implemented in a previous version of #10280
<https://github.com/scikit-learn/scikit-learn/pull/10280>, but removed for
now to simplify reviews
<https://github.com/scikit-learn/scikit-learn/pull/10280#pullrequestreview-95622713>.
If others would like to review #10280, I'm happy to follow up with the
changes requested here, which have already been implemented by Aman Dalmia
and myself.​
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