dispatch: work around UnicodeDecodeError caused by SSLError of Python 2.7.9
SSLError of Python 2.7.9 may keep error message in unicode. It will be
wrapped by URLError(reason) at KeepAliveHandler.do_open, so inst.reason can
be a unicode.
https://hg.python.org/cpython/file/v2.7.9/Modules/_ssl.c#l329
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