Fix test_inject_admin_password for OSX
Fix test_inject_admin_password for OSX

On OSX DES is used instead of MD5, see
nova.virt.disk.api:_set_password for more details

Fix bug 1084337

Change-Id: I2490e1e322d42fecb43af5436fea2f903c11e265

n0ano/gantt,n0ano/gantt