tests: Add client and clientagent msgtype declarations to common/CONSTANTS.
tests: Add client and clientagent msgtype declarations to common/CONSTANTS.

blindsighttf2/Astron,ketoo/Astron,blindsighttf2/Astron,ketoo/Astron,ketoo/Astron,blindsighttf2/Astron,blindsighttf2/Astron,ketoo/Astron,pizcogirl/Astron,pizcogirl/Astron,pizcogirl/Astron,pizcogirl/Astron