Address review comments

Author: mrambacher

cloud/examples/cloud_dump.cc

@@ -92,8 +92,8 @@ int main() {
 
   // verify that the data is somewhat sane by manaully scanning for cfs
   std::vector<std::string> cf_names;
-  s = rocksdb::DB::ListColumnFamilies(options, kDBPath, &cf_names);
-  for (std::string cf : cf_names) {
+  s = ROCKSDB_NAMESPACE::DB::ListColumnFamilies(options, kDBPath, &cf_names);
+  for (const std::string & cf : cf_names) {
     std::cout << " Found Column Family " << cf;
   }
   std::cout << " \n";