[SPARK-21128][R] Remove both "spark-warehouse" and "metastore_db" before listing files in R tests#18335

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HyukjinKwon wants to merge 1 commit intoapache:masterfrom HyukjinKwon:SPARK-21128

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Commits on Jun 17, 2017

Running R tests multiple times failed due to pre-exiting "spark-warehouse" / "metastore_db"
HyukjinKwon
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