Johan Wikman 1666c9f0b6 MXS-1464 Add config 'substitute_variables'
With this variables set to true, if $VAR is used as a value in the
configuration file, then `$VAR` will be replaced with the value of
the environment variable VAR.
2017-10-12 14:56:09 +03:00
..
2017-01-16 10:56:33 +02:00