qa/workunits/cephtest/test.sh: put 'osd ls' before any 'osd create' tests

A monc/mon connection fault or the dup command test flag may mean an extra
osd id is created that we isn't actually up; reorder so that doesn't screw
up 'osd ls'.

Signed-off-by: Sage Weil <sage@inktank.com>