Use 20min for parallel test worker timeout

Author: mame

tool/lib/test/unit.rb

@@ -282,7 +282,7 @@ def non_options(files, options)
             options[:parallel] ||= 256 # number of tokens to acquire first
           end
         end
-        @worker_timeout = EnvUtil.apply_timeout_scale(options[:worker_timeout] || 180)
+        @worker_timeout = EnvUtil.apply_timeout_scale(options[:worker_timeout] || 1200)
         super
       end