[OCSgw] [Prime] Handle Roaming

[mpeterss]

From the SGSN-MNC-MCC value in the CCR we can figure out if the subscriber is roaming.
This value should be sent all the way from OCSgw -> Prime.

For Roaming we could charge in value instead of units and therefor make a reservation of units from the amount the user can spend.

[mpeterss]

The information is actually passed from the OCSgw to Prime, but for now Prime just ignores it:

See PsInformation in the CreditControlRequest:

https://github.com/ostelco/ostelco-core/blob/develop/ocs-api/src/main/proto/ocs.proto#L85

[mpeterss]

As the information is available in Prime to be used by OCS i will close this