update container's state after we close the waitLock

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
optimize restore & use Getenv less in daemon.go

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #6121 from unclejack/refactor_daemon_restore

optimize restore & use Getenv less in daemon.go
no default default number in names

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
use stderr to debug iptables

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #6065 from vieux/fix_race_waitlock

update container's state after we close the waitLock
Merge pull request #6124 from vieux/standadize_debug_iptables

use stderr to debug iptables
Merge pull request #6123 from vieux/no_number_default

no default default number in names