Flip default for AGNOSTIC_BECOME_PROMPT (#45563)

* Flip default for AGNOSTIC_BECOME_PROMPT

* simplify AGNOSTIC_BECOME_PROMPT porting guide entry

* clarify AGNOSTIC_BECOME_PROMPT changelog entry

* fixes version typo

* uses alternate wording (rather than escaping *)

changelogs/fragments/agnostic-become-prompt.yaml

@@ -0,0 +1,2 @@
+minor_changes:
+- become - Change the default value for `AGNOSTIC_BECOME_PROMPT` to `True` so become prompts display `BECOME password:` regardless of the become method used. To display the become method in the prompt (for example, `SUDO password:`), set this config option to `False`.

docs/docsite/rst/porting_guides/porting_guide_2.8.rst

@@ -20,6 +20,26 @@ Playbook
 No notable changes.
 
 
+Command Line
+============
+
+Become Prompting
+----------------
+
+Beginning in version 2.8, by default Ansible will use the word ``BECOME`` to prompt you for a password for elevated privileges (``sudo`` privileges on unix systems or ``enable`` mode on network devices):
+
+By default in Ansible 2.8::
+
+    ansible-playbook --become --ask-become-pass site.yml
+    BECOME password:
+
+If you want the prompt to display the specific ``become_method`` you're using, instead of the agnostic value ``BECOME``, set :ref:`AGNOSTIC_BECOME_PROMPT` to ``False`` in your Ansible configuration.
+
+By default in Ansible 2.7, or with ``AGNOSTIC_BECOME_PROMPT=False`` in Ansible 2.8::
+
+    ansible-playbook --become --ask-become-pass site.yml
+    SUDO password:
+
 Deprecated
 ==========
 

lib/ansible/config/base.yml

@@ -160,9 +160,8 @@ BECOME_ALLOW_SAME_USER:
   type: boolean
   yaml: {key: privilege_escalation.become_allow_same_user}
 AGNOSTIC_BECOME_PROMPT:
-  # TODO: Switch the default to True in either the Ansible 2.6 release or the 2.7 release, whichever happens after the Tower 3.3 release
   name: Display an agnostic become prompt
-  default: False
+  default: True
   type: boolean
   description: Display an agnostic become prompt instead of displaying a prompt containing the command line supplied become method
   env: [{name: ANSIBLE_AGNOSTIC_BECOME_PROMPT}]