packaging: setup: first host id not valid on additional host

If the host id passed by answer file to hosted-engine --deploy
contains the first host id and this is an additional host
installation, discard that host id and ask for another one.

Change-Id: I5a9b601d46aa39e0272e24503242420a02a82288
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>