standardize connection variable names (#51776)

* standardize user/password connection vars

* docs: use ansible_user and ansible_password

* docs: var precedence for connection vars

* docs: ansible_become_pass -> ansible_become_password etc

lib/ansible/plugins/connection/ssh.py

@@ -47,6 +47,7 @@ DOCUMENTATION = '''
           vars:
               - name: ansible_password
               - name: ansible_ssh_pass
+              - name: ansible_ssh_password
       ssh_args:
           description: Arguments to pass to all ssh cli tools
           default: '-C -o ControlMaster=auto -o ControlPersist=60s'
@@ -605,7 +606,7 @@ class Connection(ConnectionBase):
                     b"-o", b"PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey",
                     b"-o", b"PasswordAuthentication=no"
                 ),
-                u"ansible_password/ansible_ssh_pass not set"
+                u"ansible_password/ansible_ssh_password not set"
             )
 
         user = self._play_context.remote_user
@@ -924,7 +925,7 @@ class Connection(ConnectionBase):
 
                 if states[state] == 'awaiting_prompt':
                     if self._flags['become_prompt']:
-                        display.debug('Sending become_pass in response to prompt')
+                        display.debug('Sending become_password in response to prompt')
                         stdin.write(to_bytes(self._play_context.become_pass) + b'\n')
                         # On python3 stdin is a BufferedWriter, and we don't have a guarantee
                         # that the write will happen without a flush