Support MySQL databases with BINLOG_FORMAT = STATEMENT
Support MySQL databases with BINLOG_FORMAT = STATEMENT

The MySQL database replication is currently configured with
"BINLOG_FORMAT = STATEMENT". This is incompatible with Django 2's
default isolation level and leads to the following error in "./manage.py
migrate":

    django.db.utils.OperationalError: (1665, 'Cannot execute statement:
    impossible to write to binary log since BINLOG_FORMAT = STATEMENT
    and at least one table uses a storage engine limited to row-based
    logging. InnoDB is limited to row-logging when transaction isolation
    level is READ COMMITTED or READ UNCOMMITTED.')

Force using REPEATABLE READ isolation level for now.

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