Support generating plugin suggestions in Juseppe

[oleg-nenashev]

Starting from Jenkins 2.4, it will be possible to make custom plugin suggestions in the installation wizard (see jenkinsci/jenkins#2348). These suggestions are being specified by update sites.

It would be great to have support of platform-plugins.json generation in Juseppe

[lanwen]

and what the rules of generating such suggestions?

[oleg-nenashev]

The best thing would be to write a schema definition for JSONs in Jenkins main repo...