Add rstcheck to ansible-test and correct issues. (#23550)

* Add rstcheck to ansible-test.
* Fix rst code-block languages and syntax errors.
* Fix rst inline literals.
* Update python 2 code block to pass tests on py 3.

test/runner/lib/util.py

@@ -7,6 +7,7 @@ import os
 import pipes
 import shutil
 import subprocess
+import re
 import sys
 import time
 
@@ -495,4 +496,18 @@ def docker_qualify_image(name):
     return 'ansible/ansible:%s' % name
 
 
+def parse_to_dict(pattern, value):
+    """
+    :type pattern: str
+    :type value: str
+    :return: dict[str, str]
+    """
+    match = re.search(pattern, value)
+
+    if match is None:
+        raise Exception('Pattern "%s" did not match value: %s' % (pattern, value))
+
+    return match.groupdict()
+
+
 display = Display()  # pylint: disable=locally-disabled, invalid-name