Support path setting for LOAD DATA INFILE

[HOSTED-POWER]

mysql> show global variables like 'secure_file_priv';
+------------------+-----------------------+
| Variable_name | Value |
+------------------+-----------------------+
| secure_file_priv | /var/lib/mysql-files/ |
+------------------+-----------------------+
1 row in set (0.00 sec)

Could you use this path or better allow the path for this operation to be set instead of /tmp ?

It would allow a much more secure setting on mysql ...

Now we need to allow LOAD DATA INFILE for the whole server which is insecure, read more here: https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_secure_file_priv