Use ostestr instead of the custom pretty_tox.sh

Switch to os-testr as wrapper for testr, instead of the custom
script pretty_tox.sh.

Change-Id: I5b76cf9ffca530664b1c1ddcbf98679ab4fca8b5

test-requirements.txt

@@ -6,7 +6,7 @@ mock>=1.0
 python-subunit
 oslo.sphinx
 oslotest>=1.2.0
-tempest-lib
+os-testr>=0.4.1
 testrepository>=0.0.18
 testscenarios>=0.4,<0.5
 testtools>=0.9.34

tools/pretty_tox.sh

@@ -1,6 +0,0 @@
-#!/usr/bin/env bash
-
-set -o pipefail
-
-TESTRARGS=$1
-python setup.py testr --slowest --testr-args="--subunit $TESTRARGS" | subunit-trace -f

tox.ini

@@ -11,7 +11,7 @@ setenv =
 passenv = OS_TEST_TIMEOUT
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = bash tools/pretty_tox.sh '{posargs}'
+commands = ostestr '{posargs}'
 whitelist_externals = bash
 
 [testenv:pep8]