Merge "Update documentation for DISALLOW_UNIFIED_PASSWORD." into main

     * Specifies that the managed profile is not allowed to have unified lock screen challenge with

     * the primary user.

     *

     * <p><strong>Note:</strong> Setting this restriction alone doesn't automatically set a

     * separate challenge. Profile owner can ask the user to set a new password using

     * {@link DevicePolicyManager#ACTION_SET_NEW_PASSWORD} and verify it using

     * {@link DevicePolicyManager#isUsingUnifiedPassword(ComponentName)}.

     * <p>To ensure that there is a separate work profile password, IT admins

     * have to:

     * <ol>

     *   <li>Enforce {@link UserManager#DISALLOW_UNIFIED_PASSWORD}</li>

     *   <li>Verify that {@link DevicePolicyManager#isUsingUnifiedPassword(ComponentName)}

     *       returns true. This indicates that there is now a separate work

     *       profile password configured and the set up is completed.</li>

     *   <li>In case {@link DevicePolicyManager#isUsingUnifiedPassword(ComponentName)}

     *       returns false, invoke {@link DevicePolicyManager#ACTION_SET_NEW_PASSWORD}

     *       intent and then verify again

     *       {@link DevicePolicyManager#isUsingUnifiedPassword(ComponentName)}.</li>

     * </ol>

     * </p>

     *

     * <p>Can be set by profile owners. It only has effect on managed profiles when set by managed

     * profile owner. Has no effect on non-managed profiles or users.