Add core 2.19 porting guide (#2373)

Author: sivel

docs/docsite/rst/porting_guides/core_porting_guides.rst

@@ -12,6 +12,7 @@ Please note that this is not a complete list. If you believe any extra informati
    :maxdepth: 1
    :glob:
 
+   porting_guide_core_2.19
    porting_guide_core_2.18
    porting_guide_core_2.17
    porting_guide_core_2.16

docs/docsite/rst/porting_guides/porting_guide_core_2.19.rst

@@ -0,0 +1,100 @@
+
+.. _porting_2.19_guide_core:
+
+*******************************
+Ansible-core 2.19 Porting Guide
+*******************************
+
+This section discusses the behavioral changes between ``ansible-core`` 2.18 and ``ansible-core`` 2.19.
+
+It is intended to assist in updating your playbooks, plugins and other parts of your Ansible infrastructure so they will work with this version of Ansible.
+
+We suggest you read this page along with `ansible-core Changelog for 2.19 <https://github.com/ansible/ansible/blob/stable-2.19/changelogs/CHANGELOG-v2.19.rst>`_ to understand what updates you may need to make.
+
+This document is part of a collection on porting. The complete list of porting guides can be found at :ref:`porting guides <porting_guides>`.
+
+.. contents:: Topics
+
+
+Playbook
+========
+
+No notable changes
+
+
+Command Line
+============
+
+No notable changes
+
+
+Deprecated
+==========
+
+No notable changes
+
+
+Modules
+=======
+
+No notable changes
+
+
+Modules removed
+---------------
+
+The following modules no longer exist:
+
+* No notable changes
+
+
+Deprecation notices
+-------------------
+
+No notable changes
+
+
+Noteworthy module changes
+-------------------------
+
+No notable changes
+
+
+Plugins
+=======
+
+* The ``ssh`` connection plugin now supports using ``SSH_ASKPASS`` to supply passwords
+  for authentication as an alternative to the ``sshpass`` program. The default is to use
+  ``SSH_ASKPASS`` instead of ``sshpass``. This is controlled by the ``password_mechanism``
+  configuration for the ``ssh`` connection plugin. To switch back to using ``sshpass``
+  make one of the following changes:
+
+  To your ``ansible.cfg`` file:
+
+  .. code-block:: ini
+
+     [ssh_connection]
+     password_mechanism = sshpass
+
+  By exporting an environment variable:
+
+  .. code-block:: shell
+
+     export ANSIBLE_SSH_PASSWORD_MECHANISM=sshpass
+
+  By setting the following variable:
+
+  .. code-block:: yaml
+
+     ansible_ssh_password_mechanism: sshpass
+
+Porting custom scripts
+======================
+
+No notable changes
+
+
+Networking
+==========
+
+No notable changes