Add the ability to grab Root CAs of Jenkins Agents, similar to what is done for Master at https://github.com/jenkinsci/support-core-plugin/blob/master/src/main/java/com/cloudbees/jenkins/support/impl/RootCAs.java
Just noticed it is already done: https://github.com/jenkinsci/support-core-plugin/blob/support-core-2.61/src/main/java/com/cloudbees/jenkins/support/impl/RootCAs.java#L78-L80