blockchain_import: Add database type argument

Default to LMDB.

src/blockchain_utilities/blockchain_import.cpp

@@ -724,7 +724,7 @@ int main(int argc, char* argv[])
 #if !defined(BLOCKCHAIN_DB)
   if (db_type == "lmdb")
   {
-    fake_core_db simple_core(m_config_folder, opt_testnet, opt_batch, db_flags);
+    fake_core_db simple_core(m_config_folder, opt_testnet, opt_batch, db_type, db_flags);
     import_from_file(simple_core, import_file_path, block_stop);
   }
   else if (db_type == "memory")
@@ -746,7 +746,7 @@ int main(int argc, char* argv[])
     return 1;
   }
 #if BLOCKCHAIN_DB == DB_LMDB
-  fake_core_db simple_core(m_config_folder, opt_testnet, opt_batch, db_flags);
+  fake_core_db simple_core(m_config_folder, opt_testnet, opt_batch, db_type, db_flags);
 #else
   fake_core_memory simple_core(m_config_folder, opt_testnet);
 #endif

src/blockchain_utilities/fake_core.h

@@ -57,10 +57,10 @@ struct fake_core_db
 
   // for multi_db_runtime:
 #if !defined(BLOCKCHAIN_DB)
-  fake_core_db(const boost::filesystem::path &path, const bool use_testnet=false, const bool do_batch=true, const int db_flags=0) : m_pool(&m_storage), m_storage(m_pool)
+  fake_core_db(const boost::filesystem::path &path, const bool use_testnet=false, const bool do_batch=true, const std::string& db_type="lmdb", const int db_flags=0) : m_pool(&m_storage), m_storage(m_pool)
   // for multi_db_compile:
 #else
-  fake_core_db(const boost::filesystem::path &path, const bool use_testnet=false, const bool do_batch=true, const int db_flags=0) : m_pool(m_storage), m_storage(m_pool)
+  fake_core_db(const boost::filesystem::path &path, const bool use_testnet=false, const bool do_batch=true, const std::string& db_type="lmdb", const int db_flags=0) : m_pool(m_storage), m_storage(m_pool)
 #endif
   {
     m_pool.init(path.string());