Adding fuzz directory and modifications to support it.

[catenacyber]

Adds a new target to fuzz the mysql client

Quickly finds 2 NULL derefs, but looks ok after adding checks for these

[mysql-oca-bot]

Hi, thank you for your contribution. Please confirm this code is submitted under the terms of the OCA (Oracle's Contribution Agreement) you have previously signed by cutting and pasting the following text as a comment:
"I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it."
Thanks

[catenacyber]

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-admin]

Hi @catenacyber @ChAlv ,
Thanks for contributing to MySQL
As this contribution was authored by @ChAlv , @ChAlv is the one that is authorized to contribute it and the person that needs to confirm it is submitted under the terms of the (his) OCA.

@ChAlv Please confirm this code is submitted under the terms of the OCA (Oracle's Contribution Agreement) you have previously signed by cutting and pasting the following text as a comment:
"I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it."

Thanks
==Omer