hbase.store.delete.expired.storefile should be true by default

+      // Delete the expired store files before the compaction selection.
+      if (conf.getBoolean("hbase.store.delete.expired.storefile", false)
+          && (ttl != Long.MAX_VALUE) && (this.scanInfo.minVersions == 0)) {
+        CompactSelection expiredSelection = compactSelection
+            .selectExpiredStoreFilesToCompact(
+                EnvironmentEdgeManager.currentTimeMillis() - this.ttl);
+
+        // If there is any expired store files, delete them  by compaction.
+        if (expiredSelection != null) {
+          return expiredSelection;
+        }
+      }