Remove helper script for py34

Remove the helper script for py34, it prevents the use of arguments
being passed down e.g. tox -epy34 -- --failing due to the lack of
passing {posargs} to the script. Since py34 has no special exceptions
now, the specific env for py34 with a special pretty_tox script is
not needed.

Change-Id: I4d960d82e2844c0c82a14be5e92230f1698e11b3

tools/pretty_tox_py3.sh

@@ -1,12 +0,0 @@
-#!/usr/bin/env bash
-
-set -o pipefail
-
-TESTRARGS=$1
-python setup.py testr --testr-args="--subunit $TESTRARGS" | subunit-trace -f
-retval=$?
-# NOTE(mtreinish) The pipe above would eat the slowest display from pbr's testr
-# wrapper so just manually print the slowest tests.
-echo -e "\nSlowest Tests:\n"
-testr slowest
-exit $retval

tox.ini

@@ -17,11 +17,6 @@ whitelist_externals =
   find
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY PBR_VERSION
 
-[testenv:py34]
-commands =
-  find keystone -type f -name "*.pyc" -delete
-  bash tools/pretty_tox_py3.sh
-
 [testenv:legacy_drivers]
 deps = -r{toxinidir}/test-requirements.txt
        nose