[issue30862] parent logger should also check the level

[TaoQingyun]

TaoQingyun added the comment:

yes, I understand the effective level. my question is that before call ancestor's handler, should also check `c.isEnabledFor(record.levelno)`

```
    def callHandlers(self, record):
        """
        Pass a record to all relevant handlers.

        Loop through all handlers for this logger and its parents in the
        logger hierarchy. If no handler was found, output a one-off error
        message to sys.stderr. Stop searching up the hierarchy whenever a
        logger with the "propagate" attribute set to zero is found - that
        will be the last logger whose handlers are called.
        """
        c = self 
        found = 0
        while c:
            for hdlr in c.handlers:
                found = found + 1
                if record.levelno >= hdlr.level:
                    hdlr.handle(record)
            if not c.propagate:
                c = None    #break out
            else:
                c = c.parent
...
```

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30862>
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