Replace include/leveldb with include/rocksdb.

Summary: Replace include/leveldb with include/rocksdb.

Test Plan:
make clean; make check
make clean; make release

Differential Revision: https://reviews.facebook.net/D12489

include/rocksdb/ldb_tool.h

@@ -0,0 +1,14 @@
+// Copyright 2008-present Facebook. All Rights Reserved.
+#ifndef STORAGE_ROCKSDB_INCLUDE_LDB_TOOL_H
+#define STORAGE_ROCKSDB_INCLUDE_LDB_TOOL_H
+#include "rocksdb/options.h"
+
+namespace leveldb {
+
+class LDBTool {
+ public:
+  void Run(int argc, char** argv, Options = Options());
+};
+
+} // namespace leveldb
+#endif // STORAGE_ROCKSDB_INCLUDE_LDB_TOOL_H