tests: Add Client Agent test for CLIENTAGENT_SET_SENDER_ID.
tests: Add Client Agent test for CLIENTAGENT_SET_SENDER_ID.

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