v1.8.0-rc.1

• Add new cgroup.c file based on nvcgo that supports both cgroupv1 and cgroupv2
• Move cgroup.c to cgroup_legacy.c in preparation for nvcgo implementation
• Install libnvidia-container-go.so from deps directory
• Fix DESTDIR for deps make target
• Create a go-shared library called nvcgo and wrap it in an RPC service
• Cleanup the nvc_shutdown() path when there is an error in RPC services
• Move from an nvc_context specific RPC 'driver' service to a global one
• Generalize RPC mechanism to be instantated multiple times
• Split RPC mechanism from 'driver' code into standalone RPC mechanism
• Add -fplan9-extensions to Makefile to allow structs to be "extended"
• Cleanup dead code in various components
• Allow build-all jobs to be triggered earlier for more parallelism in CI