Adding dependency documentation for MySQL.

Merging change I347e1c235bc82d6e510761f4b1c3c3de62994c2f fixing pip
info.

Co-Authored-By: Gauvain Pocentek <gauvain.pocentek@objectif-libre.com>

Change-Id: I9a1b76ed261c69a92cc3e4e6b6100e43f98fea1e
Merge "Adding dependency documentation for MySQL."