remove password leak from ovirt-engine setup answer file

Change-Id: Ie86186b48e04141d2ed7ee9b2185eb3a09bbc166
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1162781
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>
(cherry picked from commit aee7188f3f272c47e49daf10b012d4d314ec52db)