[OCSgw] [Prime] Reconnect gRPC

[mpeterss]

It seems like we are loosing the gRPC connection between OCSgw and Prime sometimes and when that happen it is not re established again until ocsgw is restarted.

Last item in logs seems to be an error on the streamobserver:

 https://github.com/ostelco/ostelco-core/blob/develop/ocsgw/src/main/java/org/ostelco/ocsgw/data/grpc/GrpcDataSource.java#L85

We also have a dependency that prime needs to be started before ocsgw.

[mpeterss]

This seems to work fine now :)