Removed unused imports.

Author: mbaedke

oak-store-document/src/test/java/org/apache/jackrabbit/oak/plugins/document/RdbConnectionUtils.java

@@ -31,9 +31,7 @@
 import java.sql.SQLException;
 import java.time.Duration;
 import java.time.Instant;
-import java.util.Collections;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 import java.util.StringTokenizer;
 import java.util.concurrent.TimeUnit;