Add copy command

Change-Id: I0a88f7fa9a096022dd95e8af8854f980ca34f043
diff --git a/src/netconf_access.hpp b/src/netconf_access.hpp
index aa13312..107fcd3 100644
--- a/src/netconf_access.hpp
+++ b/src/netconf_access.hpp
@@ -42,6 +42,7 @@
     void commitChanges() override;
     void discardChanges() override;
     Tree executeRpc(const std::string& path, const Tree& input) override;
+    void copyConfig(const Datastore source, const Datastore destination) override;
 
     std::shared_ptr<Schema> schema() override;