make functional tests run on python 3

- This change updates sanitize_log_path to
  use replace instead of string.translate so that
  it works across both python 2.7 and python 3.
- This change modifies the functional tests to run under
  python 3 by default. A new functional-py27 env is
  also added.

Change-Id: Id8127ae68cb5aeebdba73bd14fc0481cd9b773d9

os_vif/tests/functional/base.py

@@ -18,7 +18,6 @@ import functools
 import inspect
 import os
 import six
-import string
 import sys
 
 import eventlet.timeout
@@ -74,8 +73,7 @@ def setup_logging():
 
 def sanitize_log_path(path):
     """Sanitize the string so that its log path is shell friendly"""
-    replace_map = string.maketrans(' ()', '-__')
-    return path.translate(replace_map)
+    return path.replace(' ', '-').replace('(', '_').replace(')', '_')
 
 
 # Test worker cannot survive eventlet's Timeout exception, which effectively

tox.ini

@@ -1,9 +1,10 @@
 [tox]
-minversion = 2.0
+minversion = 3.1.1
 envlist = py37,py27,pep8
 skipsdist = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv =
@@ -17,11 +18,9 @@ whitelist_externals = bash
 commands = stestr run --black-regex ".tests.functional" {posargs}
 
 [testenv:pep8]
-basepython = python3
 commands = flake8
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 deps =
   {env:CONSTRAINTS_OPT}
@@ -29,29 +28,32 @@ deps =
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/doc/requirements.txt
 
-[testenv:functional]
+[testenv:functional-py27]
 basepython = python2.7
 setenv =
     {[testenv]setenv}
 commands =
     stestr run --black-regex ".tests.unit" '{posargs}'
 
+[testenv:functional]
+setenv =
+    {[testenv]setenv}
+commands =
+    stestr run --black-regex ".tests.unit" '{posargs}'
+
 [testenv:docs]
-basepython = python3
 deps =
   {env:CONSTRAINTS_OPT}
   -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:releasenotes]
-basepython = python3
 deps =
   {env:CONSTRAINTS_OPT}
   -r{toxinidir}/doc/requirements.txt
 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}/requirements.txt