[ebpf] Add the output of bpftool struct_ops dump

[jcastill]

This patch dumps all struct_ops currently existing in
the system via the commant 'bpftool struct_ops dump'.

Resolves: #2116

Signed-off-by: Jose Castillo jcastillo@redhat.com

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[bmr-cymru]

Buildbot for s390x failed but unrelated to the change in this PR - ack.