Merge pull request #5981 from philips/bump-go-systemd

vendor: bump github.com/coreos/go-systemd to v2
Merge pull request #5895 from tianon/update-authors

Update AUTHORS and .mailmap
Merge pull request #5859 from philips/append-etc-hosts-not-bind

fix(daemon): prepend host /etc/hosts instead of bind mounting
Merge pull request #5897 from jamtur01/newintro

Rewrite of the Introduction documentation
Merge pull request #5959 from tpng/patch-1

Add instructions for persisting data
Change single-dash flag usage to double-dash

The single-dash long-form flag usage is deprecated.

Docker-DCO-1.1-Signed-off-by: Nathan LeClaire <nathanleclaire@gmail.com> (github: nathanleclaire)
Merge pull request #5982 from jamtur01/bitbucket

Added BitBucket support to documentation
Merge pull request #5922 from crosbymichael/host-dev-priv

Mount /dev in tmpfs for privileged containers
Merge pull request #5976 from crosbymichael/getpids

Move get pid into cgroup implementation
Merge pull request #5746 from ImJasonH/patch-1

Update google.md
devmapper: Don't enable discard during mkfs.ext4

There is no reason to do discard durink mkfs, as the filesystem
is on a newly allocated device anyway. Discard is a slow operation,
so this may help initial startup a bit, especially if you use a larger
thin pool.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Merge pull request #5990 from alexlarsson/no-discard-mkfs

devmapper: Don't enable discard during mkfs.ext4
Merge pull request #5967 from tianon/consolidated-mkimage

Add new consolidated mkimage scripts
Merge pull request #5839 from unclejack/improve_build_rm

add --force-rm to clean up after a failed build
Add synchronization between jobs and server closing

Fixes #5154
Daemon waiting 15 seconds for finishing server jobs before shutdown. In
this time it doesn't accept new jobs. After this time, it shutdown
despite running jobs.
Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
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