Integrate "heap" metadata storage into blockstore

src/blockstore/blockstore.cpp

@@ -1,9 +1,16 @@
 // Copyright (c) Vitaliy Filippov, 2019+
 // License: VNPL-1.1 (see README.md for details)
 
+#include "str_util.h"
+
 #include "blockstore_impl.h"
+#include "v1/impl.h"
 
 blockstore_i* blockstore_i::create(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd)
 {
-    return new blockstore_impl_t(config, ringloop, tfd);
+    auto meta_format = stoull_full(config["meta_format"]);
+    if (meta_format == BLOCKSTORE_META_FORMAT_HEAP)
+        return new blockstore_impl_t(config, ringloop, tfd);
+    else
+        return new v1::blockstore_impl_t(config, ringloop, tfd);
 }