packaging: setup: Drop password and hostname from answerfile

Change Iffb05e4a520aa8f8f8a2d7f36e60aee556360302 added the
admin password and the host name as displayed in the web application
to the answer file, to allow more automation.

This answer file is also used for additional hosts setup, where this
information is undesired.

This change reverts this part.

Change-Id: Ica713fb19009875574f1c3f5f19a96b7027c952d
Bug-Url: https://bugzilla.redhat.com/1101285
Signed-off-by: Yedidyah Bar David <didi@redhat.com>