Expose # of CPUs and memory available on docker info.

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
excluding unused transformation to []byte

Signed-off-by: Igor Dolzhikov <bluesriverz@gmail.com>
builder: Update documentation WRT environment replacement

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #8807 from erikh/builder_docs

builder: Update documentation WRT environment replacement
Merge pull request #8806 from takama/ioreader

excluding unused transformation to []byte
Merge pull request #8772 from aluzzardi/docker-info-mem-cpu

Expose # of CPUs and memory available on docker info.
Update libcontainer f60d7b9195f8dc0b5d343abbc3293d

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Merge pull request #8828 from crosbymichael/update-libcontainer-oct4

Update libcontainer to f60d7b9195f8dc0b5d343abbc3293d