Wip/sipi logout (#439)
Wip/sipi logout (#439)

* sipi logout request: forcing a contentType

* tab indentation

musicEnfanthen/Knora,nie-ine/Knora,dhlab-basel/Knora,musicEnfanthen/Knora,musicEnfanthen/Knora,dhlab-basel/Knora,musicEnfanthen/Knora,nie-ine/Knora,musicEnfanthen/Knora,nie-ine/Knora,nie-ine/Knora,nie-ine/Knora,dhlab-basel/Knora,dhlab-basel/Knora,dhlab-basel/Knora,dhlab-basel/Knora,dhlab-basel/Knora,musicEnfanthen/Knora,musicEnfanthen/Knora,nie-ine/Knora