Fix cap drop issues with lxc

This uses "," instead of spaces so that the flags are parsed correctly
and also does not do a strings.Split on an empty string because
strings.Split will return a slice with one element, and empty string
causing parsing to fail when it validates that the cap exists.
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Use : to split caps in sysinit flags
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Get an extra pair of eyes on the Softlayer installation docs

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Updating to reflect changes in the SoftLayer portal and product naming conventions.

Docker-DCO-1.1-Signed-off-by: Phil Jackson <underscorephil@gmail.com> (github: underscorephil)
Removed docker_io_oauth_api.md: Docker is not currently accepting registrations for third party auth while it's determined how this will be done, if at all, in the future.

Docker-DCO-1.1-Signed-off-by: hollietealok <hollie@docker.com> (github: hollietealok)
Merge remote-tracking branch 'upstream/master' into doc_remove

Docker-DCO-1.1-Signed-off-by: hollietealok <hollie@docker.com> (github: hollietealok)
Make sure err never gets masked

Defining err as named return parameter will make sure the variable gets
assigned before returning and thus avoid masking

Docker-DCO-1.1-Signed-off-by: Johannes 'fish' Ziemke <github@freigeist.org> (github: discordianfish)
Clean up the docker socket on termination of the daemon.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Adding the query parameters to insert api call for all <= 1.10 and
removing the insert documentation for > 1.10 since it has been removed
in 1.11. This commit fixes #7183
Docker-DCO-1.1-Signed-off-by: Julien Bordellier <me@julienbordellier.com> (github: jstoja)
Update HTTP Proxy Section

Docker.service file location was missing the /usr dir.
Correct Typo In Documentation
Merge pull request #7062 from crosbymichael/fix-lxc-caps

Fix cap drop issues with lxc
Standardize "apt-get install" usage across the repo

I might have missed some, but I think this is most of the offenders.

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
fix docker integration-cli restart test race

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
Merge pull request #7280 from knappe/patch-1

Correct Typo In Documentation
move resumablerequestreader to pkg

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #7269 from r0n22/patch-1

Update HTTP Proxy Section
Merge pull request #7256 from jstoja/docs-api-insert-image

Fixing docs - Insert api call
Merge pull request #6877 from underscorephil/patch-1

Update softlayer.md
server/buildfile.go -> builder/builder.go; add maintainers file

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)