Use pretty-tox for better test output

Change-Id: I08115ff0367ae857b523a8902e4da704e094d266

test-requirements.txt

@@ -9,6 +9,7 @@ fixtures>=0.3.14
 mock>=1.0
 posix_ipc
 sqlalchemy-migrate>=0.9.1,!=0.9.2
+tempest-lib
 testrepository>=0.0.18
 testresources>=0.2.4
 testscenarios>=0.4

tools/pretty_tox.sh

@@ -0,0 +1,6 @@
+#!/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 =
     DISCOVER_DIRECTORY=murano/tests/unit
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = python setup.py test --slowest --testr-args="{posargs}"
+commands = bash tools/pretty_tox.sh '{posargs}'
 whitelist_externals = bash
 
 [testenv:pep8]