tests: Verify the configuration reparsing with real client
This tests verifies that the only the first seen option is applied
throughout all the configuration files processed. It also verifies
that the configuration files are parsed automatically and that this
behavior can be overridden by configuration option.
Signed-off-by: Jakub Jelen <firstname.lastname@example.org>
Reviewed-by: Andreas Schneider <email@example.com>