Adds handling of scaled life cycle operation

Configures alarms on vdus created after a scaling operation, which
correspond to the 'scaled' message, using the same handler used with
the 'instantiated' message, in which a check has been added to avoid
duplicate alarms.
It also fixes the vdu name used when creating the alarm through MON,
which is now the vdur name and not the vdu-id-ref used in the vnfd.
Finally, it adds a check for the scaling-type param in the scaling policy,
only executing the autoscaling logic if it is set to 'automatic'.

Signed-off-by: Benjamin Diaz <bdiaz@whitestack.com>
Change-Id: I3499ebdb5605f80ff73d905fbe3ac61d0d806687