Merge "tox: Drop basepython"

tox.ini

@@ -1,11 +1,9 @@
 [tox]
 envlist = py3,pep8
-minversion = 3.1.1
+minversion = 3.18.0
 skipsdist = True
-ignore_basepython_conflict = True
 
 [testenv]
-basepython = python3
 usedevelop = True
 allowlist_externals = {toxinidir}/tools/tox_install.sh
 install_command = {toxinidir}/tools/tox_install.sh {env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
@@ -20,7 +18,6 @@ commands =
 sitepackages = False
 
 [testenv:cover]
-basepython = python3
 setenv =
     PYTHON=coverage run --source blazarnova --parallel-mode
 commands =