fix: typo in socket name
fix: display all benchs at the end (despite early exit)
new: opan-pcap-multiple function to open a pcap with several threads

Same idea than open-iface-multiple
fix: missing bench from reports

bench_finited but not inited
chg: always delete netmatch .so files when loaded successfully.
chg: various minor fixes wrt. thread cancelation
chg: bench_display() has no more reason to be public
chg: Release safe_region rwlock while destructing unreachable objects