[#189] blobstor: Implement DumpInfo method

Implement method to get the information about the BLOB storage.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/blobstor/info.go

@@ -0,0 +1,19 @@
+package blobstor
+
+import (
+	"os"
+)
+
+// Info groups the information about BlobStor.
+type Info struct {
+	// Permission bits of the root directory.
+	Permissions os.FileMode
+
+	// Full path to the root directory.
+	RootPath string
+}
+
+// DumpInfo returns information about the BlobStor.
+func (b *BlobStor) DumpInfo() Info {
+	return b.fsTree.Info
+}