Resync the DCO text with upstream at http://developercertificate.org/

```
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
```

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
docker save: --output flag

for those that do not care to redirect stdout

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
docker save: add and improve docs

add usage examples for `docker save ...`

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Remove duplication of Dns in config merging.

Fixes #4714
Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
api/client: var style tweak

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Fix double single dash arg issues in docs

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
rename lxc to bridge

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)
Merge pull request #4796 from cpuguy83/fix_single_dash_args_in_dcs

Fix double single dash arg issues in docs
Added Eixo::Docker to the list of libraries

Docker-DCO-1.1-Signed-off-by: Javier Gómez <alambike@gmail.com> (github: alambike)
Merge pull request #4803 from alambike/patch-1

Added Eixo::Docker to the list of libraries
Merge pull request #4518 from tianon/sync-DCO-with-developercertificate.org

Resync the DCO text with upstream at http://developercertificate.org/
Fix since time exit display when s.FinishedAt is zero

When s.FinishedAt is zero, the since time exit in docker ps doesn't display correct time.
For example
```
Exited (0) 292.471209 years ago
```
This patch fixes the since time exit to display nothing if s.FinishedAt is zero.

Docker-DCO-1.1-Signed-off-by: Ken ICHIKAWA <ichikawa.ken@jp.fujitsu.com> (github: ichik1)
Merge pull request #4761 from ichik1/fix-display-of-since-time-exit

Fix since time exit display when s.FinishedAt is zero
Merge pull request #4800 from vieux/rename_network_driver

rename lxc to bridge
Merge pull request #4775 from LK4D4/remove_duplicate_dns_#4714

Remove duplication of Dns in config merging.
Revert "fix failing test to use kill instead of stop"

This reverts commit 4434dcee89f7d0d0239f6b492b24e940cdbafb21.

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Revert "Disable automatic killing of containers when docker stop fails"

This reverts commit 8b5cf51d600dc4f3611cf063c52cf3448e7b01e5.

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Workaround for hanging events. Fixes #4804

Docker-DCO-1.1-Signed-off-by: LK4D4 <lk4d4math@gmail.com> (github: LK4D4)
Merge pull request #4832 from LK4D4/fix_events_hanging_#4804

Workaround for hanging events. Fixes #4804
Merge pull request #4835 from crosbymichael/reverst-stop-kill

Revert back to the default stop functionality of SIGKILL after timeout