Currently user password update require interactive prompting of user's
original password. This is problematic because we can't support
non-interactive applications and therefore hinders automation. This
patch make it possible by optionally accepting an
'--original-password' argument. If specified, we would use it instead
of prompting.
DocImpact
Change-Id: I2d994e8c2be949f7ae616ac1d1594fb94e1a27cd
Closes-Bug: 1531360
5cbecc130e