Add support for update password
Add support for update password

Activate the password update feature.

Change-Id: I1a622edbd3a1858e9dcb585a79dbb7bba9281471

cmin764/cloudbase-init,stackforge/cloudbase-init,ader1990/cloudbase-init,stefan-caraiman/cloudbase-init,alexpilotti/cloudbase-init,chialiang-8/cloudbase-init,openstack/cloudbase-init