German Syomin

Results 3 issues of German Syomin

Currently, data generating scripts (data_generator.py, etc) are using SQLAlchemy to access db. Those must be moved to be part of the center itself and use Django ORM.

src/check_mysql_conf.py: Empty files with only [mysqld] line are producing an error in pt-config-diff - checking if there is at least one non-empty line in the config file.