clientIF: return doneCode in getDiskAlignment

Engine expects a dictionary instead of an integer(0)

Change-Id: I9effa0c05b711cd2f1983009f92819cb315ec9f0
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=998411
Signed-off-by: Yeela Kaplan <ykaplan@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/18737
Reviewed-by: Sergey Gotliv <sgotliv@redhat.com>
Tested-by: Sergey Gotliv <sgotliv@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>