Add mention of mounting cgroupfs properly to PACKAGERS.md

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
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.
Add cpuset.cpus to cgroups and native driver options
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Add unit test for lxc conf merge and native opts
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
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)
As far as I know this code is not used or maintained
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Promote btrfs
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
Merge pull request #4778 from vbatts/vbatts-save_to_output

`docker save --output` flags
Merge pull request #4837 from crosbymichael/remove-ci

Remove docker-ci code from the repo
Merge pull request #4751 from enokd/master

Fixes #3369 Repeated slash-'/' characters; harmonize across all name-related commands
Merge pull request #4786 from SvenDowideit/run--lxc-conf-is-lxc-driver-only-atm

add a note that --lxc-conf is lxc-driver only.
Add Chef usage documentation

Docker-DCO-1.1-Signed-off-by: Brian Flad <bflad417@gmail.com> (github: bflad)
docker load: add --input flag

for those that do not care to read from redirected stdin

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Fix typo in Using Chef documentation description

Docker-DCO-1.1-Signed-off-by: Brian Flad <bflad417@gmail.com> (github: bflad)