netsniff-ng, trafgen: drop privileges if wished

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
examples: move them to contrib, since they don't belong here

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
conf: rename folder

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Merge branch 'master' of github.com:borkmann/netsniff-ng