Adrien Béraud authored Sep 05, 2017 and Adrien Béraud committed Sep 13, 2017

Add a method to change a Ring account archive password.
The method is blocking and returns a boolean indicating if
the operation succeeded.

Note that the change won't be transferred to other devices
connected to the same account unless they are initialized
after the change, from the device where the password was changed.

Change-Id: Ide36bf407f75178e0019ab5dab511a79139b844c