Including eBPF with Onload

To use eBPF with Onload:

1. Build Onload with BPF support when using the onload_install script:

   # onload_install --build profile cloud

2. Enable native kernel BPF program functionality (is enabled by default):

   #define CI_CFG_WANT_BPF_NATIVE  1

   This is in: /src/include/ci/internal/transport_config_opt.h.