DATAREDIS-1151 - change clean method `keys` command to `scan`#532

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eyison wants to merge 4 commits intospring-projects:masterfrom

Commits on May 21, 2020

change clean method `keys` command to `scan`
eyison
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Commits on Jun 17, 2020

batch delete directly
eyison
committed

Commits on Jun 21, 2020