Add message to identify timing-related test fails

On MacOS we're still seeing occasional failures, presumably due to
the child process taking too long to start that the parent process
times out.
Adding this log message should prove exactly how long it takes to start
the child process.

tests/test_record_values.py

@@ -756,6 +756,8 @@ def none_value_test_func(self, record_func, queue):
 
         record = record_func("SOME-NAME", **kwarg)
 
+        log("CHILD: About to start IOC")
+
         dispatcher = asyncio_dispatcher.AsyncioDispatcher()
         builder.LoadDatabase()
         softioc.iocInit(dispatcher)