Make includes relative, change namespace, support unity build

Subtrees/hyperleveldb/util/testutil.cc

@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
-#include "util/testutil.h"
+#include "testutil.h"
 
-#include "util/random.h"
+#include "random.h"
 
-namespace leveldb {
+namespace hyperleveldb {
 namespace test {
 
 Slice RandomString(Random* rnd, int len, std::string* dst) {
@@ -48,4 +48,4 @@ extern Slice CompressibleString(Random* rnd, double compressed_fraction,
 }
 
 }  // namespace test
-}  // namespace leveldb
+}  // namespace hyperleveldb