fix tox python3 overrides

We want to default to running all tox environments under python 3, so
set the basepython value in each environment.

We do not want to specify a minor version number, because we do not
want to have to update the file every time we upgrade python.

We do not want to set the override once in testenv, because that
breaks the more specific versions used in default environments like
py35 and py36.

Also update pylint to 1.9.2.

Change-Id: I3492f6f9061a08d28bfde1a1ea1bc820c2b082c8
Signed-off-by: Doug Hellmann <doug@doughellmann.com>
Signed-off-by: Chuck Short <chucks@redhat.com>

lower-constraints.txt

@@ -31,7 +31,7 @@ pep8==1.7.1
 prettytable==0.7.2
 pyflakes==1.0.0
 Pygments==2.2.0
-pylint==1.4.5
+pylint==1.9.2
 pyparsing==2.1.0
 pyperclip==1.5.27
 python-mimeparse==1.6.0

test-requirements.txt

@@ -5,6 +5,6 @@ flake8<2.6.0,>=2.5.4 # MIT
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 mock>=2.0.0 # BSD
-pylint==1.4.5 # GPLv2
+pylint==1.9.2 # GPLv2
 stestr>=2.0.0 # Apache-2.0
 testtools>=2.2.0 # MIT

tox.ini

@@ -33,6 +33,7 @@ python_files = test_*.py
 norecursedirs  = .tox .venv
 
 [testenv:venv]
+basepython = python3
 commands = {posargs}
 
 [testenv:py27]
@@ -45,13 +46,16 @@ basepython = python3.5
 basepython = python3.6
 
 [testenv:docs]
+basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -b html doc/source doc/build/html
 
 [testenv:pep8]
+basepython = python3
 commands = flake8 freezerclient
 
 [testenv:pylint]
+basepython = python3
 commands = pylint --rcfile .pylintrc freezerclient
 
 [flake8]
@@ -69,6 +73,7 @@ exclude = .venv,.tox,dist,doc,*egg,releasenotes
 
 
 [testenv:releasenotes]
+basepython = python3
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
     -r{toxinidir}/requirements.txt