Add func_py3 toxenv

Use python3 to bootstrap the tox venv.

Change-Id: I8e3519141f5d8b8de0d9a6b539bd85060ae1e97a

bindep.txt

@@ -30,6 +30,9 @@ libffi-dev        [platform:dpkg]
 python2.7         [platform:dpkg]
 python-apt        [platform:dpkg]
 python-dev        [platform:dpkg]
+python3           [platform:dpkg]
+python3-apt       [platform:dpkg]
+python3-dev       [platform:dpkg]
 
 # Base requirements for RPM distros
 gcc               [platform:rpm]

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 minversion = 2.0
 skipsdist = True
-envlist = docs,linters,functional
+envlist = docs,linters,functional,func_py3
 
 
 [testenv]
@@ -109,6 +109,15 @@ commands =
     bash -c "{toxinidir}/tests/common/test-ansible-functional.sh"
 
 
+[testenv:func_py3]
+basepython = python3
+deps =
+    {[testenv:ansible]deps}
+commands =
+    bash -c "{toxinidir}/tests/tests-repo-clone.sh"
+    bash -c "{toxinidir}/tests/common/test-ansible-functional.sh"
+
+
 [testenv:linters]
 deps =
     {[testenv:ansible]deps}