Be able to set (and clear) stored credentials for sessions from host page.

CW-7676346

Partner noted it can be tedious joining each session, logging in (if not already logged in), prompting for storage, and then providing the username/password for each session. Being able to set/clear these from the host page would be preferred. Doing so in such as way that it can be set for multiple sessions at the same time would be preferred as well.