eBPF toy code examples (running in kernel) to familiarize yourself

with syntax and features:

 - bpf_shared.c		-> Ingress/egress map sharing example

 - bpf_tailcall.c	-> Using tail call chains

 - bpf_cyclic.c		-> Simple cycle as tail calls

 - bpf_graft.c		-> Demo on altering runtime behaviour

 - bpf_map_in_map.c     -> Using map in map example