The self-service password API was left intentionally
unprotected in a change during the stable/ocata cycle:
I4d3421c56642cfdbb25cb33b3aaaacbac4c64dd1
The default policy was not removed from the same config and as a
result it was migrated into code during the policy-in-code work.
This isn't necessary since it's not used to protect anything. Policy
should still be enforced on administrative password resets, but that
is done using the `update_user` API.
Change-Id: I431f5ef9d6d5d689a06736640d22997fbddb869c
Closes-Bug: 1705485