Merge "docs: update for pdf-build"

Author: Zuul

doc/requirements.txt

@@ -1,5 +1,5 @@
 openstackdocstheme>=2.2.1 # Apache-2.0
 os-api-ref>=1.4.0 # Apache-2.0
 reno>=3.1.0 # Apache-2.0
-sphinx>=2.0.0,!=2.1.0 # BSD
+sphinx>=2.2.0 # BSD
 sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD

tox.ini

@@ -119,12 +119,10 @@ deps =
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-allowlist_externals = make
-                      rm
 deps = {[testenv:docs]deps}
+allowlist_externals = make
 commands =
-  rm -rf doc/build/pdf
-  sphinx-build -n -W --keep-going -b latex doc/source doc/build/pdf
+  sphinx-build -W -b latex doc/source doc/build/pdf
   make -C doc/build/pdf
 
 [testenv:trovestack]