When importing existing builds we end up with kits that are not
defined by the user yet. These kits are destroyed if the user does
not import those builds after all.

This patch marks these kits as temporary till they are accepted and
become permanent.

Change-Id: I4789a457abfb3cf26e855a4fed553c330be312e1
Reviewed-by: Daniel Teske <daniel.teske@digia.com>