Update Included Certificates in Trust Bundle

[tall27]

Summary of the new feature/enhancement

Trust bundle is an object that allow to group and distribute Root and issuing CA certificates to the target machines. There is a need to modify this object when the certificate is expired or a new certificate need to be distributes across the organization. Current Set-TPPAtribute command remove any existed values and adds the specified certificate.

Proposed technical implementation details (optional)

I want to add an additional value to the existed list. troubleshooting the issue I've found that Str-TPPAttribute uses config/write api call that replaces entire list with the value in API. use of the AddValue (POST) call successfully adds an extra value.