ENV variable value could contain '=' (for example mysql://host/db?pool=10)

Fixes #7363

This fixed the just committed change handling non existent Ghost state.

This doesn't exist anymore and causes ansible to throw a KeyError

Default docker version 0.9.1 from Ubuntu 14.04 LTS don't report APIVersion.

The JSON the Docker API returns includes the container's ENTRYPOINT value (if it has one) with the 'Command' value. So instead of checking if `container['Command'] == module.params['command']`, we just check that `container['Command'].endswith(module.params['command'])` so the entrypoint won't affect a container being properly classified as matching the module params or not.

Also I refactored a super-long `if` statement into some temporary variables - I did it to help me figure out what was going wrong, and then it makes the code more readable so I kept it.

see https://github.com/dotcloud/docker-py/commit/18d4db09ecc79cef49830fa2c28c5e99dd02be42

As part of being updated for the 1.10 API, a couple of parameters were passed to the docker.client.start() command that it doesn't accept. This caused the module to error out if it tried to start any Docker containers. This removes those parameters so the module works again.

docker bugfixes: trim whitespace around list param elements, handle list params being coerced to int or long type

Useful for development environments.  Setting these options to true
allows you to `docker attach` to a docker container started with
ansible.

The new present state just makes sure that a container exists, not that
it's running, although it get started one creation.
This is very useful for data volumes. This also changes the old
present, now running (default) state to only create the container if
it's not found, otherwise it just get started.

See also discussion on mailinglist:
https://groups.google.com/forum/#!topic/ansible-devel/jB84gdhPzLQ

This closes #6395

All modules should be using /usr/bin/python in the shebang as ansible_python_interpreter processes this (see FAQ).
Fixing for standardization purposes.

raise errors when omitted, updated changelog with new modules.

When using repositories other than the main one at docker.io, the image name contains the repo name (which itself contains ":" as a separator between domain and port). We don't really care about it here, so just get rid of it before looking at the image name.