Adapt scale tests for new connection-status value
After Encapsulate netconf-node state the “connection-status” leaf
was moved into the “netconf-node“ container. This change also
eliminates the requirement of specifying model in
the connection-status leaf. Update netconf scale tests with this new
value, if version is at least scandium.
JIRA: INTTEST-147
Change-Id: Ie0a6f51f221f1cd6c43982fe70063a7c98e60797
Signed-off-by: Martin Balaz <martin.balaz@pantheon.tech>
Signed-off-by: Ivan Hrasko <ivan.hrasko@pantheon.tech>