execdriver flag for docker daemon

  like the storage-driver flag, this implements a flag for choosing the
  execdriver to be used, defaulting to lxc.

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)
Add basics for controlling a container's lifecycle

Docker-DCO-1.1-Signed-off-by: Brian Goff <cpuguy83@gmail.com> (github: cpuguy83)
Correct port range in OS X installation doc

Docker-DCO-1.1-Signed-off-by: Thomas Schroeter <thschroeter@gmail.com> (github: thschroeter)
Merge pull request #4225 from cpuguy83/4208-update_docs_to_better_explain_docker_run

Doc: Add basics for controlling a container's lifecycle
FIX: Linux mint troubleshooting tip

Package is called 'cgroup-lite' not 'cgroups-lite'. Verified on Linux Mint 16.

Ref http://packages.ubuntu.com/search?keywords=cgroup-lite

Docker-DCO-1.1-Signed-off-by: Dan Williams <me@deedubs.com> (github: deedubs)
don't skip cert check for an example & use HTTPS

This changes two URLs from http to https and it fixes a Dockerfile to
stop skipping certificate validation. It also adds the ca-certificates
package to that Dockerfile example.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Add back the Ubuntu "Memory and Swap Accounting" section that was lost when the "Kernel" page was culled

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #4231 from thschroeter/correct-port-range-in-os-x-install

Correct port range in OS X installation doc
lets talk about the other way to make base images

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Archive: Add Add Lgetxattr and Lsetxattr implementations

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
archive: extract xattrs from tarfiles

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
archive: Detect file changes to capability bits

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
archive: Handle capabilities in tar files

If a file has a security.capability set, we push this to the tar file.
This is important to handle in e.g. layer files or when copying files
to containers, as some distros (e.g. Fedora) use capability bits as
a more finegrained version of setuid bits, and thus if the capabilites
are stripped (and setuid is not set) the binaries will fail to work.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Site ver for Webmaster tools

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Merge pull request #4257 from jamtur01/sitever

Site ver for Webmaster tools
Fix misspelling

Docker-DCO-1.1-Signed-off-by: Adrian Mouat <adrian@adrianmouat.com> (github: amouat)
docs: explain DNS warnings & how to fix them

This explains how to fix the DNS warnings on Ubuntu and why they're
shown.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
forbid chained onbuild, from & maintainer triggers

This changes the way onbuild works:
- forbids the chaining of onbuild instructions
- forbids the use of `onbuild from`
- forbids the use of `onbuild maintainer`

It also makes docker throw errors when encountering such triggers when
executing the triggers during `FROM`.

Three tests have been added:
- ensure that chained onbuild (`onbuild onbuild`) is forbidden
- ensure that `onbuild from` is forbidden
- ensure that `onbuild maintainer` is forbidden

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Merge pull request #3845 from alexlarsson/tar-caps

Implement capabilitiy bit storage in layers
Fix build command auth by adding the auth config and registry objects to the build job environment.

Docker-DCO-1.1-Signed-off-by: Jake Moshenko <jake@devtable.com> (github: jakedt)