Comment # 1 on bug 1047613 from zhen ren

A promising upstream fix for this issue:

commit 70c340dbc25523de18195a7916f27aa37b051e43
Author: Heinz Mauelshagen <heinzm@redhat.com>
Date:   Tue Jul 4 19:34:10 2017 +0200

    test: return 0 if ignoring 'a' device health chars is requested

    This allows lvconvert-raid-reshape-striped_to_linear.sh to succeed when
    it reduces raid5 to two stripes before converting to raid1 and linear.