vpptrace: add support for tracing memif interfaces
vpptrace: add support for tracing memif interfaces

brecode/vpp,rastislavszabo/vpp,brecode/vpp,rastislavszabo/vpp,brecode/vpp,rastislavszabo/vpp,rastislavszabo/vpp,brecode/vpp,rastislavszabo/vpp,rastislavszabo/vpp,rastislavszabo/vpp,brecode/vpp