xtables-save: Unify *-save header/footer comments

Make eb- and arptables-save print both header and footer comments, too.
Also print them for each table separately - the timing information is
worth the extra lines in output.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
7 files changed