Pytest-mysql

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- [Enhancements] Add support for MySQL 5.7.6 and up with new configuration options. Legacy configuration supports older MySQL and MariaDB databases.
- [breaking] mysql_exec ini option replaced with mysql_mysqld_safe
- [breaking] --mysql-exec cmd option replaced with --mysql-mysqld-safe
- [breaking] replaced mysql_init ini option with mysql_install_db
- [breaking] replaced --mysql-init cmd option with --mysql-install-db
- [breaking] added mysql_mysqld option and --mysql-mysqld cmd option

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- [enhancements] removed path.py dependency

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- [enhancement] change deprecated getfuncargvalaue to getfixturevalues, require at least pytest 3.0.0

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- [enhancements] create command line and pytest.ini configuration options for mysql's log directory location
- [enhancements] create command line and pytest.ini configuration options for mysql's starting parametetrs
- [enhancements] create command line and pytest.ini configuration options for mysql test database name
- [enhancements] create command line and pytest.ini configuration options for mysql's user password
- [enhancements] create command line and pytest.ini configuration options for mysql user
- [enhancements] create command line and pytest.ini configuration options for mysql host
- [enhancements] create command line and pytest.ini configuration options for mysql port
- [enhancements] create command line and pytest.ini configuration options for mysql's init executable
- [enhancements] create command line and pytest.ini configuration options for mysql's admin executable
- [enhancements] create command line and pytest.ini configuration options for mysql executable
- [enhancements] create command line and pytest.ini configuration options for mysql logsdir