network: rework TLV-based protocol

This patch reworks the TLV-based protocol to reduce the overhead
in the message building. The idea is to group some attributes
that must be present in a consistent configuration. Putting them
together help us to save some cycles in the message building.

Now, oprofile reports ~15% of samples in the build path instead
of ~25%. CPU consumption for 3000 HTTP GET requests per second
(1000 concurrent with apache benchmark tool) is ~45% in my
testbed, that is ~19% more consumption than with no replication
at all.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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