Fix expect for python 3 (#24912)

* Fix expect for python 3

- Change generator next to python 3 compatible
- Added tests for expect

* Add pexpect to integration.txt

- add pexpect library to requirements for integration tests

* Use ansible_python_interpreter in integration tests for expect

* Use double-quotes for expect integration tests

* Cast user input to string for expect integration tests

* Cast user input to string earlier in expect integration tests

* Use ansible.module_utils.six.moves input for expect integration tests

* Fix yamllint errors in the expect test

* Use cat to trigger timeout for expect integration tests

* Use realpath filter in expect integration tests

lib/ansible/modules/commands/expect.py

@@ -116,7 +116,7 @@ def response_closure(module, question, responses):
 
     def wrapped(info):
         try:
-            return resp_gen.next()
+            return next(resp_gen)
         except StopIteration:
             module.fail_json(msg="No remaining responses for '%s', "
                                  "output was '%s'" %