introduce NFCT input plugin hash table for start/end timestamps. Based on an

original patch by Christian Hentschel, amended like:

1) the hash table has to be per-instance, since [at least in the future]
   we can have nfnetlink messages routed from other machines over the
   network, thus every NFCT instance has to have it's own hash table.
2) Whether or not to use a preallocated table is now a configuration
   value, as is the number of buckets and max_entries
3) configure_nfct was not used in the struct ulogd_plugin.configure
4) don't put the hashtable buckets in BSS, but rather allocate them
   dynamically
5) allocate all ct_timestamps (in the preallocated case) at once, rather
   than malloc()ing each on its own.
6) use official IPFIX fields for flow start and flow end instead of
   private numbers
7) use llist instead of list (linuxlist.h adds an additional 'l')
8) add lots of TODO items
9) add IPFIX_NF_conntrack_id to header file

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