Merge branch 'master' into bump_v0.9.0

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Bump to version 0.9.0
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Fix a few packaging bugs, including and especially a temporary patch to our upstart script to mount cgroups properly

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Docker-DCO-1.1-Signed-off-by: Tianon Gravi <admwiggin@gmail.com> (github: crosbymichael)
Merge pull request #4489 from crosbymichael/bump_v0.9.0

Bump to version 0.9.0
remove utils.go

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge branch 'release' into merge_release_v0.9.0

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Change version to v0.9.0
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
move opts out of pkg because it's related to docker

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge pull request #4561 from crosbymichael/merge_release_v0.9.0

Merge release v0.9.0
Merge pull request #4562 from vieux/remove_utils_in_docker_package

Remove utils in docker package