typo fix in logging bind_address of gRPC server

[zyxue]

just typo fix

[seldondev]

Hi @zyxue. Thanks for your PR.

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[seldondev]

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[axsaucedo]

@zyxue thank you for the contribution! It seems the python lint is failing, you may need to run the formatters

[zyxue]

@axsaucedo , mind take another look to see if it can be merged now, pls?

[ukclivecox]

@zyxue Thanks!