fix tox.ini

Change-Id: Idea680f5612ff09d2814c346105988d6313c1dcf

tox.ini

@@ -18,7 +18,9 @@ deps =
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
-passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
+passenv = http_proxy
+	  https_proxy
+ 	  no_proxy
 
 [testenv:debug-py36]
 basepython = python3.6
@@ -48,7 +50,7 @@ deps =
 commands =
     rm -rf doc/build/html
     sphinx-build -W -b html doc/source doc/build/html
-whitelist_externals =
+allowlist_externals =
     rm
 
 [testenv:pdf-docs]
@@ -57,7 +59,7 @@ commands =
     rm -rf doc/build/pdf
     sphinx-build -W -b latex doc/source doc/build/pdf
     make -C doc/build/pdf
-whitelist_externals =
+allowlist_externals =
     make
     rm
 
@@ -68,7 +70,7 @@ deps =
 commands =
   rm -rf releasenotes/build releasenotes/html
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
-whitelist_externals = rm
+allowlist_externals = rm
 
 [testenv:debug]
 # It runs tests from the specified dir (default is sahara_plugin_spark/tests)