Add dianogstic_name and fail_on_error to serialized task

By default add diagnostic_name which is equals to:
plugin.name-plugin.version
And fail_on_error which can be provided by task input
equals to True

related to blueprint cinder-neutron-plugins-in-fuel

Change-Id: Iceb483f816fc84192bb0d669c3fb360843d0cd3a
Merge "Add dianogstic_name and fail_on_error to serialized task"