doc: update conntrack-tools manual

This update adds to the documentation the following information:

* add reference to "Demystifying cluster-based fault-tolerant firewalls"
* add how-to disable the external cache
* add how-to disable the internal cache
* add how-to set the synchronization transport protocol
* document iptables CT target
* ask for sponsors to finish H323 and SIP support.

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

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