There was code to support set literals (on Python 2.7 and newer), but it
was buggy: SAFE_NODES.union() doesn't modify SAFE_NODES in place,
instead it returns a new set object that is then silently discarded.

I added a unit test and fixed the code.  I also changed the version
check to use sys.version_tuple instead of a string comparison, for
consistency with the subsequent Python 3.4 version check that I added in
the previous commit.

Two things changed in Python 3.4:

- 'basestring' is no longer defined, so use six.string_types

- True/False are now special AST node types (NamedConstant) rather than
  just names

(Good thing we had tests, or I wouldn't have noticed the 2nd thing!)

I found only one place where safe_eval() is called inside the ansible
codebase: in lib/template/__init__.py.  The call to safe_eval(result,
...) is protected by result.startswith('...'), which means result cannot
possibly be a byte string on Python 3 (or startswith() would raise, so
six.string_types (which excludes byte strings on Python 3) is fine here.

Fixes #12314

cloudstack: new integration test role test_cs_user

Fixes #12313

Required as part of fix for #12123

Fixes #12123

Rename ansible_ssh_{host,port,user} in docs to ansible_*

The _ssh variants will continue to work, but the shorter, more generic
names are preferred now.

Doc fixes

Resurrection of the comment filter

Python 3: use the right PyYAML SafeRepresenter for unicode

PyYAML has a SafeRepresenter in lib/... that defines

    def represent_unicode(self, data):
        return self.represent_scalar(u'tag:yaml.org,2002:str', data)

and a different SafeRepresenter in lib3/... that defines

    def represent_str(self, data):
        return self.represent_scalar('tag:yaml.org,2002:str', data)

so the right thing to do on Python 3 is to use represent_str.

(AnsibleUnicode is a subclass of six.text_type, i.e. 'str' on Python 3.)

change ec2 util to create only requested objects

Fixes #12282

Typo in comment: "bsaename" → "basename"

Vault missing DataLoader for pwd file #12293

Fixes #12301

Allows ANSIBLE_LIBRARY to overload core modules even if the module in
ANSIBLE_LIBRARY doesn't have a .py extension.

Fixes #12284

Fix problem with "=" in the initial file path.

Revert "remove closing connections after every task, this goes against conneciton caching and was not expected behaviuor nor inhertited from v1"
needed for winrm, disabled closing connections in ssh to avoid issues with that persistance, need to normalize all this in future

This reverts commit 23a22397.

Also fixes a template path lookup issue when using an include

Fixes #12277

Python 3: use six.string_types instead of basestring

* Turn strings into byte strings before passing to shlex and turn them
  back into unicode strings after they are retyurned from there

  Fixes #12257