HBASE-8300 TestSplitTransaction fails to delete files due to open handles left when region is split (Malie Yin)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1467512 13f79535-47bb-0310-9956-ffa450edef68

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionFileSystem.java

@@ -540,6 +540,8 @@ public class HRegionFileSystem {
         return null;
       }      
     }
+ 
+    f.getReader().close(true);
     
     Path splitDir = new Path(getSplitsDir(hri), familyName);
     // A reference to the bottom half of the hsf store file.