Fixes for tox 4.0

Formatting changes in config file required for tox 4.0.

Change-Id: I84202ac10e9195647162f0b5737ebb610ef1ef93

tox.ini

@@ -8,7 +8,7 @@ ignore_basepython_conflict=true
 usedevelop = True
 basepython = python3
 setenv = VIRTUAL_ENV={envdir}
-         PYTHONDONTWRITEBYTECODE = 1
+         PYTHONDONTWRITEBYTECODE=1
          LANGUAGE=en_US
          LC_ALL=en_US.UTF-8
          PYTHONUNBUFFERED=1
@@ -19,7 +19,12 @@ deps =
   -r{toxinidir}/test-requirements.txt
 commands =
     stestr run --slowest {posargs}
-passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
+passenv = http_proxy
+          HTTP_PROXY
+          https_proxy
+          HTTPS_PROXY
+          no_proxy
+          NO_PROXY
 
 [testenv:unit-with-driver-libs]
 deps = {[testenv]deps}