Use ostestr for tests

The ostestr command has nicer output and it seems like it is going
to have better filtering.

Change-Id: Ia0210b52dee4d1bf56e590e85bbb3ff73d4c0573

test-requirements.txt

@@ -8,10 +8,11 @@ discover
 fixtures>=0.3.14
 mock>=1.0
 python-subunit>=0.0.18
-requests-mock>=0.6.0 # Apache-2.0
-sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
 oslosphinx>=2.5.0 # Apache-2.0
 os-client-config>=1.2.0
+os-testr>=0.1.0
+requests-mock>=0.6.0 # Apache-2.0
+sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
 testrepository>=0.0.18
 testscenarios>=0.4
 testtools>=1.4.0

tox.ini

@@ -10,7 +10,7 @@ setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = python setup.py testr --slowest --testr-args='{posargs}'
+commands = ostestr {posargs}
 
 [testenv:functional]
 setenv = OS_TEST_PATH=./openstack/tests/functional