packaging: setup: saving memcheck parameter to answer file

This new implementation allows saving memcheck parameter to answer
file during setup. This helps skipping the interactive confirmation
to continue by using False value in the answerfile.

Change-Id: I351b129c396d34fb1def8a8ddd1180e21aeeab14
Bug-Url: https://bugzilla.redhat.com/993698
Signed-off-by: Alex Lourie <alourie@redhat.com>