Add Sockets (-H) list to `docker -D info`.

This will allow us to _know_ what the user's -H settings are, which may
be useful for debugging later.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
move api docs to APIv1.13

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Lets not download the gravatar and then download a different one after the js is triggered

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Merge pull request #6633 from SvenDowideit/avoid-extra-gravatar-download

Lets not download the gravatar and then download a different one after t...
cp's -T and --reflink=auto are only available on GNU coreutils

Docker-DCO-1.1-Signed-off-by: Kato Kazuyoshi <kato.kazuyoshi@gmail.com> (github: kzys)
Migrate TestGetEvents into a unit and a CLI test

Docker-DCO-1.1-Signed-off-by: Guilherme Salgado <gsalgado@gmail.com> (github: gsalgado)
Move truncindex in separate package in pkg/

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Merge pull request #5413 from SvenDowideit/docker-info-list-sockets

Add Sockets (-H) list to `docker -D info`.
Improve truncindex benchmarks

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Benchmarks for engine/env

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Update libcontainer to 5210a236b92a8022a673108f347
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Update libcontainer references
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Rename libcontainer.Container to libcontainer.Config
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Merge pull request #6216 from gsalgado/convert-integration-tests

Convert integration/api_test:TestGetEvents into a unit test and a CLI test
Merge pull request #6648 from LK4D4/truncindex_bench

Truncindex benchmarks
Merge pull request #6595 from LK4D4/env_benchmarks

Benchmarks for engine/env
Merge pull request #6650 from crosbymichael/update-libcontainer-post-refactor

Update libcontainer dep to 5210a236b92a8022a673108f347
Merge pull request #6643 from kzys/freebsd-cp

cp's -T and --reflink=auto are only available on GNU coreutils