CTS for DPM.resetPassword() (part 1: DO/PO case)

DO/PO should still be able to change/clear the password even if one is
already set.

Also renamed "MixedProfileOwnerTest" to "MixedManagedProfileOwnerTest"
and added "MixedProfileOwnerTest" for the pure-PO case.

TODO Add a test for the DA case too.

Bug 25645900
Bug 25506830
Bug 26827204

Change-Id: Id562b45cfb71796091215d3d4a9d026387232f72
6 files changed