gRPC frontend for CTA

gRPC based frontend for disk storage systems. This is thin layer that only populates

Configuration

The cta-frontend-grpc interface requires only connection to the CTA catalog and the scheduler. Those configurations are taken from /etc/cta/cta-catalogue.conf and /etc/cta/cta.conf. The TPC port number used to accept storage system requests is specified in /etc/sysconfig/cta-frontend-grpc and defaults to 17017.