NETCONF: list instance queries should hit the ops tree as well

getItems() operates on config and operation data, not just on the config
data. It is possible that there are lists which only live in an ops data
subtree.

Change-Id: I0206290dfcc4c1ebe91b4728f8e7a9230fc387cb
diff --git a/src/netconf_access.cpp b/src/netconf_access.cpp
index 777e94e..f744dc6 100644
--- a/src/netconf_access.cpp
+++ b/src/netconf_access.cpp
@@ -195,7 +195,7 @@
         actualList->insert(selectionLeaf);
     }
 
-    auto instances = m_session->getConfig(NC_DATASTORE_RUNNING, list->print_mem(LYD_XML, 0));
+    auto instances = m_session->get(list->print_mem(LYD_XML, 0));
 
     if (!instances) {
         return res;