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

added methods for retrieving vapp and vm