User settings validation issues

- Validate username
- Validate email
- Read-only username field format change
- Do not show Status field when adding user

Fix for https://github.com/Rise-Vision/common-header/issues/194, https://github.com/Rise-Vision/common-header/issues/219,
https://github.com/Rise-Vision/common-header/issues/220, https://github.com/Rise-Vision/common-header/issues/172