#### Expected behavior
MessageId object serialize method is broken at least in python 3.7
pulsar.MessageId.latest.serialize()
Should return a string
#### Actual behavior
>>> pulsar.MessageId.earliest.serialize()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 1:
invalid start byte
#### Steps to reproduce
As above
#### System configuration
pulsar-client 2.1.0 and Python 3.7
[ Full content available at: https://github.com/apache/pulsar/issues/2708 ]
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