This object is used to create and delete threshold templates.
The values of nmsifthTemplateName and
nmsifthTemplateNotifyHoldDownType must be provided before
activating the entry.
An entry can only be deleted when there are no active entries
in the nmsifthTemplateIfAssignTable with the same value of
nmsifthTemplateIndex.
When an entry is deleted, all associated entries in the
nmsifthThresholdTable are also deleted.
After the entry has been activated, this object cannot be set
to any value other than 'destroy'. The row status never
changes to 'notInService' after reaching the value 'active'.