Command line clients don't work with Connector/C configuration files

Since mysql command line clients use their own configuration file parser, it is not possible to add Connector/C specific options in e.g. client section

Example:

[client]

reconnect=1

ssl_enforce=1

Starting command line client now ends up with an error:

$ mysql

mysql: [ERROR] unknown variable 'ssl_enforce=1'.

Possible solutions:

• read options via MariaDB Connector/C
• ignore unknown keywords
• support an additional default section [connector] in Connector/C which will contain key/value pairs only used by Connector/C.