Add copy command

Change-Id: I0a88f7fa9a096022dd95e8af8854f980ca34f043
diff --git a/src/sysrepo_access.hpp b/src/sysrepo_access.hpp
index cebb564..da5fb75 100644
--- a/src/sysrepo_access.hpp
+++ b/src/sysrepo_access.hpp
@@ -40,6 +40,7 @@
 
     void commitChanges() override;
     void discardChanges() override;
+    void copyConfig(const Datastore source, const Datastore destination) override;
 
 private:
     std::vector<std::map<std::string, leaf_data_>> listInstances(const std::string& path) override;