packaging: setup: host id must not be saved in answer file

saving the host id in the answer file leads to having
the same host id of the first host also on additional
hosts. With this patch the host id is not saved
anymore in the answer file.

Bug-Url: https://bugzilla.redhat.com/1014004
Change-Id: Ia742cfe1fd2c3c3c140edb0fa290bdff7b9f4e38
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>