Added stats.go which provides strong types for all stats that will be exported by libcontainer. This commit only introduces the strong type.
Docker-DCO-1.1-Signed-off-by: Vishnu Kannan <vishnuk@google.com> (github: vishh)
now busybox as nc

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Add check for iptables xlock support
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #6022 from crosbymichael/iptables-wait

Add check for iptables xlock support
Merge pull request #6018 from vishh/stats_strongtype

Strong type all stats exported by libcontainer
Merge pull request #6020 from vieux/update_test_remove_nc_bind_mount

now busybox as nc