use global config options

* Use the global configuration options for the pathnames of the grid host
  certificate and the key.

Signed-off-by: Christoph Anton Mitterer <mail@christoph.anton.mitterer.name>
corrected small typo in X.509

Signed-off-by: Christoph Anton Mitterer <mail@christoph.anton.mitterer.name>
Merge pull request #40 from calestyo/missing-files-semsg-cert-locations

Missing files semsg cert locations.

Signed-off-by: Christoph Anton Mitterer <christoph.anton.mitterer@lmu.de>
Acked-by: Gerd Behrmann <behrmann@nordu.net>