1007 Use KDU name and NS id for model names

This commit is part of the fix for Bug 1007. Previously
The wrong naming was used in the uninstall function and
it was deleting each application one by one. Now the whole
model will be deleted automatically.
This commit is dependent on this one in LCM:
https://osm.etsi.org/gerrit/#/c/osm/LCM/+/8555/

Additionally the naming for models has changes so that
each KDU gets is own model with the following naming:
<kdu-name>-<ns-id> . This will fix multi KDU support.

Change-Id: I912105417d67d5f3d95b997b91d7a5b7388bdf0d
Signed-off-by: Dominik Fleischmann <dominik.fleischmann@canonical.com>