remove some explicit tox environments

Tox knows about different python versions without us having to be
explicit, so consolidate some of the configuration to take advantage of
tox's feature.

Change-Id: I1b83cf23ad2a513c7b22c8ac5e19f3d9b54e8cb1

Author: dhellmann

tox.ini

@@ -9,6 +9,7 @@ deps = virtualenv
        stevedore
 setenv =
     TOXIC = true
+    SHELL = /bin/bash
 whitelist_externals =
     bash
     zsh
@@ -18,11 +19,6 @@ whitelist_externals =
 deps = flake8
 commands = flake8 virtualenvwrapper docs/source/conf.py
 
-[testenv:py27]
-setenv =
-  SHELL = /bin/bash
-commands =  bash ./tests/run_tests {envdir} []
-
 # Not sure why the basepython setting is needed, but on my system if
 # it isn't included then the python version picked up for 2.6 is
 # actually 2.7.
@@ -35,16 +31,6 @@ setenv =
   SHELL = /bin/bash
 commands =  bash ./tests/run_tests {envdir} []
 
-[testenv:py33]
-setenv =
-  SHELL = /bin/bash
-commands =  bash ./tests/run_tests {envdir} []
-
-[testenv:py34]
-setenv =
-  SHELL = /bin/bash
-commands =  bash ./tests/run_tests {envdir} []
-
 [testenv:zsh]
 basepython=python2.7
 setenv =