[SPARK-32305][BUILD] Make `mvn clean` remove `metastore_db` and `spark-warehouse`#29103

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LuciferYang wants to merge 1 commit intoapache:masterfrom

LuciferYang:add-clean-directory

Commits on Jul 14, 2020

add directory to should be cleaned up to maven-clean-plugin
LuciferYang
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