Configure stestr directly

Change-Id: I20ac87956a7d0cdb49012c12a194e0207eb603b9

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./unit_tests
+top_dir=./

.testr.conf

@@ -1,8 +0,0 @@
-[DEFAULT]
-test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
-             OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
-             OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-60} \
-             ${PYTHON:-python} -m subunit.run discover -t ./ ./unit_tests $LISTOPT $IDOPTION
-
-test_id_option=--load-list $IDFILE
-test_list_option=--list

test-requirements.txt

@@ -2,7 +2,7 @@ charm-tools>=2.4.4
 requests>=2.18.4
 mock>=1.2
 flake8>=2.2.4,<=2.4.1
-os-testr>=0.4.1
+stestr>=2.2.0
 python-keystoneclient>=1.7.1
 git+https://github.com/openstack-charmers/zaza.git#egg=zaza;python_version>='3.0'
 coverage>=4.5.2

tox.ini

@@ -13,7 +13,7 @@ setenv = VIRTUAL_ENV={envdir}
          AMULET_SETUP_TIMEOUT=5400
 install_command =
   pip install {opts} {packages}
-commands = ostestr {posargs}
+commands = stestr run {posargs}
 whitelist_externals = juju
 passenv = HOME TERM AMULET_* CS_API_*
 deps = -r{toxinidir}/test-requirements.txt
@@ -52,7 +52,7 @@ setenv =
     PYTHON=coverage run
 commands =
     coverage erase
-    ostestr {posargs}
+    stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml