DO NOT MERGE: Fix DPM.ACTION_SET_NEW_PASSWORD

This is a cherry-pick of ag/1640561.

1. Context.getActivityToken is not available in n mr2, passed the token
   from the activity to the controller instead.

2. Haven't pick the tests from master to mr2 branch because robotest
   is not set up in mr2 branch.

Fix: 32959373

Change-Id: I2f73d01ab11e91b337beb90c05bbcb857dfd40dc