Changed the way to access juju data in k8s_08 testsuite.

Now juju commands are executed via SSH on the OSM host and it is not necessary to have juju installed on the client.
Deleted k8s_08-simple_k8s_scaling_data.py (obsolete).

Change-Id: I0cffb5e227f57a6e12555c7120e3faf4956857ca
Signed-off-by: aguilard <e.dah.tid@telefonica.com>
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>