Rely on OSLO.config

OSLO.config is now used by all the services. The hack in place to
correctly find the right config file is apparently (by way of the
comments) only required for the gate.

Therefore we should be able to remove this.

Change-Id: If5c5d5a4711de21624b2e75e99cc785520ab6aba
Merge "Rely on OSLO.config"