now check stderr also on become for ssh plugin for the cases where sudo or su do…

now check stderr also on become for ssh plugin for the cases where sudo or su do not want to prompt/echo on stdin
fixes #11796

lib/ansible/plugins/connections/ssh.py

@@ -377,7 +377,7 @@ class Connection(ConnectionBase):
                 become_errput = ''
                 while True:
                     self._display.debug('Waiting for Privilege Escalation input')
-                    if self.check_become_success(become_output) or self.check_password_prompt(become_output):
+                    if self.check_become_success(become_output + become_errput) or self.check_password_prompt(become_output + become_errput):
                         break
 
                     rfd, wfd, efd = select.select([p.stdout, p.stderr], [], [p.stdout], self._play_context.timeout)
@@ -398,7 +398,7 @@ class Connection(ConnectionBase):
                     if not chunk:
                         raise AnsibleError('Connection closed waiting for privilege escalation password prompt: %s ' % become_output)
 
-                if not self.check_become_success(become_output):
+                if not self.check_become_success(become_output + become_errput):
                     self._display.debug("Sending privilege escalation password.")
                     stdin.write(self._play_context.become_pass + '\n')
                 else: