fix 1214: mark k8scluster ENABLED when task is finished

Set a new k8scluster satus DEGRADED when one of helm-chart or
juju-bundle is not ready. Capture known exceptions avoiding
unneeded traceback on logs

Change-Id: Id4e6c7807d923325bd754fd52ded5772541b1687
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>