Including eBPF with Onload - UG1586

To use eBPF with Onload:

1. Build Onload using the cloud build profile. See the instructions in Installation.
2. Confirm that native kernel BPF program functionality is enabled (it is by default):

   #define CI_CFG_WANT_BPF_NATIVE  1

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