packaging: setup: always generate answer file

Always generate an answer file after customization.
If a path is not specified by command line the answer
file is generated at
/etc/ovirt-hosted-engine/answers.conf

Change-Id: I94006bd5950d37b69f1b39dda9a5a55388962ab9
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>
packaging: setup: avoid passwords in answerfile

avoid to save clear text passwords in generated
answerfile.

Change-Id: Ie06165793c02ab49ceb2b7869ff2d8d944920198
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>