Datepicker input doesn’t get `touched` and `ng-touched` properties when choosing a date

Bug description:

When choosing a date on an input with the ngbDatepicker directive on a Reactive Form the corresponding FormControl doesn’t get the touched property set to true nor the input field get the ng-touched class.

Link to minimally-working plunker that reproduces the issue: http://plnkr.co/edit/ulNJTzkjIbAZxdVmSCsx?p=preview

Version of Angular, ng-bootstrap, and Bootstrap:

Angular: 2.0.2

ng-bootstrap: 1.0.0-alpha.8

Bootstrap: 4.0.0-alpha.4

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