No validation done when user resets a password

### The required feature described as a wish

Steps to reproduce the issue

1. Enable the global setting "user.password.reset.enabled"

2. Click on forgot password option from the UI

3. User provides the same password, Cloudstack doesn't validate the password and sets the same password for the user

Expected behaviour

Cloudstack should validate if the same password is used for reset password, this can prevent security related issues

Start by tracing the CloudStack password-reset flow from the UI after enabling "user.password.reset.enabled". Check where the submitted password is validated and verify that resetting to the existing password is rejected, using the reproduction steps and expected behavior as the completion criteria.

Written by the indexing model from the issue text.