Add StartCom CAs to truststore

Description

A significant amount of publicly available XMPP domains use StartCom StartSSL-based security. We should have their CA certificate in our default truststore. This will make S2S communication over TLS easier to accomplish. We'll add the CA and Sub level 1 certificates.

Environment

None
Fixed

Assignee

Guus der Kinderen

Reporter

Guus der Kinderen