ring: break out timestamping since not directly related

Break out the timestamping part of the ring.h file, since it's not
directly related to the {t,r}x_ring. Also inlining doesn't make
sense here.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
zsh: add netsniff-ng zsh auto completion support

Hideo Hattori wrote a set of auto completion scripts for zsh that
support netsniff-ng tools. Big thanks for that! Follow-up commits
still need to address updated command-line options.

Signed-off-by: Hideo Hattori <hhatto.jp@gmail.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>