Make all cgroup stats output int64s instead of float64.

Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
Merge pull request #5994 from vmarmol/libcontainers-stats

Make all cgroup stats output int64s instead of float64.
add recursive device nodes

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
update test

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #5995 from vieux/recur_nodes

Add device nodes recursively
Fix add hang when dest is .

Fixes #3960
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
adding test for hanging ADD src .

Docker-DCO-1.1-Signed-off-by: Tibor Vass <teabee89@gmail.com> (github: tiborvass)
Merge pull request #25 from tiborvass/3960-add-file-hangs

adding test for hanging ADD src .
Merge pull request #5997 from crosbymichael/add-hang

Fix add hang when dest is .
Merge remote-tracking branch 'upstream/master'

Docker-DCO-1.1-Signed-off-by: Zac Dover <zdover@redhat.com> (github: zdover23)