Added scaffolding for an unload container function

lib/pipeline/rpc/request_register.rb

@@ -18,6 +18,8 @@ module Pipeline::Rpc
         puts "dropping response"
       else
         req = entry[:req]
+        resp = msg.parsed_msg
+        resp.delete("return_address")
         req.send_result(msg.parsed_msg)
         unregister(addr)
       end

lib/pipeline/rpc/router.rb

@@ -226,6 +226,9 @@ module Pipeline::Rpc
       elsif req.parsed_msg["action"] == "deploy_container_version"
         new_version = req.parsed_msg["new_version"]
         config.add_container_version!(channel, track_slug, new_version)
+      elsif req.parsed_msg["action"] == "unload_container_version"
+        new_version = req.parsed_msg["new_version"]
+        req.send_error({ msg: "action not yet implemented" })
       else
         req.send_error({ msg: "action unknown" })
         return