OpenApi create required operational data

OpenApi create required operational data

Create only required operational data to provide example
for operational GET request.
This removed duplicity with configurational and operational nodes
in OpenApi schemas by creating only operational container and lists.

For container and lists are created specific GET request only for
operational data. This patch solves this by creating only required
operational data and not mixing them with configurational data.

JIRA: NETCONF-1142
Change-Id: I4f1f544f9cf65b6f58ad9c2068cec6ac1c0927f0
Signed-off-by: Peter Suna <peter.suna@pantheon.tech>
Signed-off-by: Ivan Hrasko <ivan.hrasko@pantheon.tech>