Fixed the horrible OSX installation docs

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
import sha512 to make sha512 ssl certs work

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Add alex as devmapper and btrfs maintainer
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
cgroups: Update systemd to match fs backend

This updates systemd.Apply to match the fs backend by:
* Always join blockio controller (for stats)
* Support CpusetCpus
* Support MemorySwap

Also, it removes the generic UnitProperties in favour of a single
option to set the slice.

Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)
Move envconfig generation to lxc driver
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #5600 from unclejack/sha512_registry_support

import sha512 to make sha512 ssl certs work
add etchosts

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
add resolvconf

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #5611 from vieux/networkfs_pkgs

add 2 networkfs pkgs
Merge pull request #5609 from crosbymichael/move-env-gen
Merge pull request #5597 from jamtur01/docs-simplify-osx-install

Fixed the horrible OSX installation docs
Merge pull request #5354 from alexlarsson/cgroups-systemd-fixes

cgroups: Update systemd to match fs backend
propagate errors write

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
Merge pull request #5613 from vieux/better_error_handling

propagate errors write
Move Attach from container to daemon

This moves the Attach method from the container to the daemon.  This
method mostly supports the http attach logic and does not have anything
to do with the running of a container.
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
Merge pull request #5614 from crosbymichael/move-attach-to-daemon

Move Attach from container to daemon
Use the correct "it's."
Merge pull request #5601 from crosbymichael/alex-maintainer

Add alex as devmapper and btrfs maintainer
Add alex as devmapper and btrfs maintainer
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)
add linked containers to hosts file

Docker-DCO-1.1-Signed-off-by: Bryan Murphy <bmurphy1976@gmail.com> (github: bmurphy1976)

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)
Tested-by: Solomon Hykes <solomon@docker.com> (github: shykes)