Merge "tox: Use new constraints option"

Author: Zuul

tox.ini

@@ -1,14 +1,15 @@
 [tox]
-minversion = 4.2.5
+minversion = 4.28.0
 envlist = py3,pep8
 
 [testenv]
 usedevelop = True
 passenv =
   PROMETHEUS_*
   OBSERVABILITY_*
+constraints =
+  {env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}
@@ -46,7 +47,6 @@ commands =
 
 [testenv:docs]
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build --keep-going -b html doc/source doc/build/html
@@ -74,6 +74,5 @@ application-import-names = observabilityclient
 
 [testenv:releasenotes]
 deps =
-  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees --keep-going -b html releasenotes/source releasenotes/build/html