Draft: over master: improve NETCONF performance

Andrei Pavel requested to merge 2400-netconf-performance-over-master into master

... by retrieving data nodes only once from the sysrepo datastore and iterating through them to get the leaves and leaf-list nodes that are required, as opposed to retrieving each and every leaf and leaf-list node from the datastore.

This empirically reduced the time required to push a configuration of 60k leaves and leaf-list nodes from approximately 9m30s to 3s.

Closes #2400 (closed).

Edited by Andrei Pavel

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