stun: add header file

Add a header file for stun functions.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
rnd: move entropy source definition to rnd

It's better off there anyway.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
tstamping: add header file for packet timestamping

Better add a header file for this, so that we do not need to have it
in multiple places declared.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
misc: cleanup header comments

Remove header comments where appropriate. And also clean up colorize
a bit.

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