Changes

* C/R with {{Opt|--empty-ns}} still handled iptables configuration

* C/R with {{Opt|--empty-ns}} still handled iptables configuration

* SCM messages inside UNIX socket got lost after C/R (now dump aborted)

* SCM messages inside UNIX socket got lost after C/R (now dump aborted)

* Empty unixsk.img file appeared when dumping tasks with '''no''' unix sockets

* Empty unixsk.img file appeared when dumping tasks ''without'' unix sockets

* Install procedure wasn't PEP-394 compliant

* Install procedure wasn't PEP-394 compliant

* CRIU blocking netfilter rules were added at the tail of the chain resulting in unlocked TCP connections

* CRIU blocking netfilter rules were added at the tail of the chain resulting in unlocked TCP connections

* Dump/Restore spurious failures when open() returned 0 descriptor

* Dump/Restore spurious failures when open() returned 0 descriptor