Merge "[ussuri][goal] Drop python 2.7 support"

doc/requirements.txt

@@ -3,6 +3,5 @@
 # process, which may cause wedges in the gate later.
 
 openstackdocstheme>=1.11.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
 yasfb>=0.5.1

test-requirements.txt

@@ -3,7 +3,6 @@
 # process, which may cause wedges in the gate later.
 
 openstackdocstheme>=1.11.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
 flake8
 yasfb>=0.5.1

tox.ini

@@ -1,9 +1,11 @@
 [tox]
-minversion = 2.0
+minversion = 3.1.1
 envlist = docs,pep8
 skipsdist = True
+ignore_basepython_conflict = True
 
 [testenv]
+basepython = python3
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 setenv =
@@ -11,7 +13,6 @@ setenv =
 deps = -r{toxinidir}/test-requirements.txt
 
 [testenv:docs]
-basepython = python3
 whitelist_externals = rm
 commands =
   rm -fr doc/build
@@ -19,13 +20,11 @@ commands =
   doc8 --ignore D001 doc/source
 
 [testenv:pep8]
-basepython = python3
 commands =
   flake8
   doc8 --ignore D001 specs/
 
 [testenv:venv]
-basepython = python3
 commands = {posargs}
 
 [flake8]