[PATCH 4/*] libnfnetlink fixes

[Pablo Neira]

This fixes:

a) Check for bad file descriptor, otherwise this can result in a 
infinite loop during event display cancelation.

b) Return 0 on success. -100 is ugly and we this since we use explicit 
ACK confirmation (NLM_F_ACK) since it's cleaner.

c) nfnl_nest and nfnl_nest_end to build up nested attributes.

d) NLMSG_TAIL introduced in recent rtnetlinkv2 changes.
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