This work fulfills PR #11799. Moved the content out of the vault file,
into best practices, edited it, then referenced it from variables and
vaults content files.

Fixes #12742

Python 3: don't convert module arguments to bytes

This reverts commit 073f10a5 and instead
disables the failing test.

We're focusing on Python 3 support on the controller first; modules will
come later.

Fixes a test failure:

    ======================================================================
    ERROR: test_module_utils_basic_ansible_module_creation (units.module_utils.test_basic.TestModuleUtilsBasic)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "/home/mg/src/ansible/test/units/module_utils/test_basic.py", line 250, in test_module_utils_basic_ansible_module_creation
        supports_check_mode=True,
      File "/home/mg/src/ansible/lib/ansible/module_utils/basic.py", line 470, in __init__
        self._check_required_arguments()
      File "/home/mg/src/ansible/lib/ansible/module_utils/basic.py", line 1050, in _check_required_arguments
        self.fail_json(msg="missing required arguments: %s" % ",".join(missing))
      File "/home/mg/src/ansible/lib/ansible/module_utils/basic.py", line 1445, in fail_json
        sys.exit(1)
    SystemExit: 1
    -------------------- >> begin captured stdout << ---------------------
    {"msg": "missing required arguments: foo", "failed": true}

because converting 'foo' to bytes yields b'foo' on Python 3, which
doesn't match the native-unicode 'foo' argument spec.

Python 3: there's no basestring

added "include" for ansible_ssh_ change to another section

Fixes #12719

Ansible ssh changes docswork

Python 3: there's no iteritems()

Make ansible.vars.unsafe_proxy Python 3 friendly

Instead of str and unicode we have to deal with bytes and str.

Fixes ImportError: No module named '__builtin__' on Python 3.

AnsibleModules.log() fix for python3

Also add unittests for AnsibleModules.log()

Fixes #12586

* corrupt/invalid file causes tracebacks
* incorrect initialization of display/_display in BaseCacheModule class
* tweaking the way errors in get() on jsonfile caches work, to raise
  a proper AnsibleError in that situation so the playbook/task is stopped

Fixes #12708

Fixes #12711

ansible_ssh_* changes from 1.9 to 2.0, original note made into a separate file
for easier editing, and an include for this new file added to each of the 6 file affected
by this change

Added an option to use the private network IP address for DigitalOcean dynamic inventory 

Removed deletion of salt by 'password' lookup