With the exception of nfnetlink_log (packet is sent to userspace for
dissection/logging), all of them log to the kernel ringbuffer.
This is the first part of a series to merge all modules except
nfnetlink_log into a single module: nf_log_syslog.
This allows to reduce code. After the series, only two log modules remain:
nfnetlink_log and nf_log_syslog. The latter provides the same
functionality as the old per-af log modules.
This renames nf_log_ipv4 to nf_log_syslog.
Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>