Pins docutils to <0.17 until breaking behaviour is fixed (apache#16133)

Sphinx RTD theme 0.5.2. introduced limitation to docutils to account for
some docutils markup change:

readthedocs/sphinx_rtd_theme#1112
(cherry picked from commit 6fd9c01)

setup.py

@@ -502,7 +502,12 @@ def get_sphinx_theme_version() -> str:
     'bowler',
     'click~=7.1',
     'coverage',
-    'docutils',
+    # Sphinx RTD theme 0.5.2. introduced limitation to docutils to account for some docutils markup
+    # change:
+    #      https://github.com/readthedocs/sphinx_rtd_theme/issues/1112
+    # This limitation can be removed after this issue is closed:
+    #      https://github.com/readthedocs/sphinx_rtd_theme/issues/1115
+    'docutils<0.17',
     'filelock',
     'flake8>=3.6.0',
     'flake8-colors',