Don't read my.cfn config file by default (MySQL)

[tomislater]

It might be difficult to debug what is going on, so I propose to use --no-defaults flag in mysqld_safe command (https://github.com/ClearcodeHQ/pytest-dbfixtures/blob/master/src/pytest_dbfixtures/factories/mysql.py#L121). Maybe it is not the best approach to resolve this problem.

Another idea in my head: provide a flag --defaults-file? and use a file from this param. If user does not use this flag, use --no-defaults flag.

From documentation (http://dev.mysql.com/doc/refman/5.6/en/mysqld-safe.html#option_mysqld_safe_defaults-file):

--no-defaults
Do not read any option files. This must be the first option on the command line if it is used.

[fizyk]

Actually being able to set all possible values for fixture, would be much better, and we would impose this separation from my.cnf file completely.

[fizyk]

However this would be blocked by #160

[fizyk]

This issue was moved to ClearcodeHQ/pytest-mysql#8