Fix IOC indexation

Regression from b9c1b838

Calling utils.trigger_ioc_repository_creation runs launch_task
which does a db.session.add(task). This raises:

SAWarning: Usage of the 'Session.add()' operation is not currently
supported within the execution stage of the flush process. Results may
not be consistent.  Consider using alternative event listeners or
connection-level operations instead.

SAWarning: Attribute history events accumulated on 1 previously clean
instances within inner-flush event handlers have been reset, and will
not result in database updates.

The result is that the host is not added to the elasticsearch index.

We can't trigger the task in after_update/after_insert events.
Perform the call in the view instead. It's temporary anyway. This should
be handled by IOC Factory.

JIRA INFRA-1015