[fdo-internals] Handle the case for invalid MySql host

[Jack Lee]

This submission fixes a problem that the message returned is in English
when trying to connect to an invalid host. 

 

Since the language setting is only used by the MySql server daemon and
the client does not use the language setting, the mysql api returns the
message in English when calling msg_error when using an invalid host.

 

The MySQL provider has been changed to handle this special case of
invalid host by checking the error number and replacing with our own
message.

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