core: Use error for audit log on import template from configuration.

Use error audit log instead of refular audit log when the import VM from
configuration fails

Change-Id: I134f3a2015b7f249a361bd237b824709f7210f40
Bug-Url: https://bugzilla.redhat.com/1140584
Signed-off-by: Maor Lipchuk <mlipchuk@redhat.com>