CHANGELOG.md: remove duplicate entry about docker

docker_image: added support for docker_py >= 0.3.0, Docker API >= 1.8. Replace #6178

This reverts commit b769b418, reversing
changes made to 1e01fb85.

Fix regression causing setup to run for every play

This patch makes sure setup only runs once, unless it is enforced on a play.

Adds modules for managing Amazon RDS parameter and subnet groups.

get rid of newline chars when reading password file

typo fix

added better gentoo/funtoo support

missing import in assert module

Fixed missing ansible.errors import in assert module

Update CHANGELOG.md

Remove the legacy templating code, which was guarded by deprecation warnings in the previous two releases, and undocumented for a long time.  use {{ foo }} to access variables instead of ${foo} or $foo.

Show more whitespace throughout playbook examples to encourage better standards in first playbooks folks write.

the primary name of the parameter in the examples.

Trim references to fireball as we want folks using accelerate or pipelining options.  Fireball is pretty well deprecated at this point, but will still be part of the release.

Fixes #5800

Update intro_configuration.rst

Fully delete 'ssh_old' and 'paramiko_alt' options

Typo in rabbitmq_plugin docs

Support ssh-ed25519 keys

The newest version of OpenSSH supports a new, wonderful key type. authorized_key incorrectly discards pubkeys of this type as busted because it doesn't recognize type signature.

If no group was specified, but a group by the same name as the user
exists, an error was raised in the situation where USERGROUPS_ENAB is
enabled in /etc/login.defs (which is the case for almost every major
linux distro). In this case, the user will be put in group 100 (which
is usually the "users" group on those same distros). This is currently
only done in the base class, as the issue may not exist on other
platforms like AIX or the BSDs.

Fixes #6210

Should be "plugins", not "users".