Remove ssh tcp check.

Kitchen docker uses the "wait_for_sshd" method in Test Kitchen to
determine when the container is available to ssh into. Since the Docker
server builds containers with SSH access on random ports, this presents
a problem when on networks that deny TCP checks to these ports.

As a workaround, I implemented an alternative that checks the state of
the Docker container to determine if it is up.
Remove logger.info message.
Add ENV['DOCKER_HOST'] as default socket and add docs
added a stderr redirect to the docker binary check because docker on OSX uses stderr to print output and ruby is interpretting this as an error
set use_sudo flag to false when using the run command to check if docker exists
Add `--cpuset` option to kitchen-docker driver

This allows use of the docker `--cpuset` option in order to set cpu
affinities for suite containers. It also introduces a mechanism for checking
the current docker version as this feature is only available >= 1.1.0.
Add documentation for cpuset option in kitchen-docker
add check for valid container id
update dns flag, make inspect command quieter
added a stderr redirect to the docker binary check because docker on OSX uses stderr to print output and ruby is interpretting this as an error
set use_sudo flag to false when using the run command to check if docker exists
tell verify_dependencies to be quieter

Running anything `kitchen`-related with kitchen-docker now produces lengthy stderr output, which makes it harder to see things.

Add redirection for STDERR when running the docker binary, as now running the `docker` command outputs to STDERR (version 1.2.0).
This is addressed in a [not-yet-released commit](https://github.com/docker/docker/commit/61b129d81802e3c988cc0e67e488b24968dd748a) where the `help` command is redirected.
added gentoo support
added emerge and paludis support for gentoo
added missing sudo for gentoo
set use_sudo flag to false when using the run command to check if docker exists
tell verify_dependencies to be quieter

Running anything `kitchen`-related with kitchen-docker now produces lengthy stderr output, which makes it harder to see things.

Add redirection for STDERR when running the docker binary, as now running the `docker` command outputs to STDERR (version 1.2.0).
This is addressed in a [not-yet-released commit](https://github.com/docker/docker/commit/61b129d81802e3c988cc0e67e488b24968dd748a) where the `help` command is redirected.
added gentoo support
added emerge and paludis support for gentoo
added missing sudo for gentoo