tox: Group targets and tool configuration together

Easy readability win.

Change-Id: Ic93c57cf2ffd73d75a88bc1efc8d67ee163a6c1f
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

tox.ini

@@ -28,6 +28,10 @@ commands = {posargs}
 basepython = python3
 commands = python setup.py build_sphinx
 
+[testenv:releasenotes]
+basepython = python3
+commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
+
 [testenv:cover]
 basepython = python3
 commands =
@@ -38,6 +42,13 @@ commands =
 basepython = python3
 commands = bandit -r oslo_log -x tests -n5
 
+[testenv:lower-constraints]
+basepython = python3
+deps =
+  -c{toxinidir}/lower-constraints.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/requirements.txt
+
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
 
@@ -47,14 +58,3 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,__init__.py
 
 [hacking]
 import_exceptions = oslo_log._i18n
-
-[testenv:releasenotes]
-basepython = python3
-commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
-
-[testenv:lower-constraints]
-basepython = python3
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt