disable the secure_file_priv check

disable the secure_file_priv check

Last-Update: 2016-04-18
Forwarded: not-needed
Origin: vendor

MySQL 5.7 introduced a premission check for export and import operations.
In Ubuntu, only the full mysql-server package creates the set system wide
directory causing mysqld-akonadi to error out on startup if only
mysql-server-core-5.7 is installed.
To prevent that the key is set to empty, which reverts mysqld to the 5.6
behavior.
See http://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_secure_file_priv

Gbp-Pq: Name kubuntu_disable_secure_file_priv_check.diff