Fix test runner config issues with os-testr 1.0.0

The os-testr 1.0.0 release had a couple of required config changes due
to it's internal usage of stestr. This commit fixes those by adding a
.stestr.conf (to remove a warning) sets the fixture env variables in
the tox.ini instead of being hidden in .testr.conf and removing the
quotes around posargs to make passing args to ostestr actually work.
Also to keep the expected dev experience stestr is used directly for
places where ostestr was called directly.

Change-Id: Ib0fbcb2e7710a6b8219c56ef2a4462c61ea498a9

.gitignore

@@ -13,6 +13,7 @@
 .project
 .pydevproject
 .ropeproject
+.stestr/
 .testrepository/
 .tox
 .idea

.stestr.conf

@@ -0,0 +1,4 @@
+[DEFAULT]
+test_path=${OS_TEST_PATH:-./nova/tests}
+top_dir=./
+group_regex=nova\.tests\.functional\.api\.openstack\.placement\.test_placement_api(?:\.|_)([^_]+)

tox.ini

@@ -15,6 +15,9 @@ setenv = VIRTUAL_ENV={envdir}
          OS_TEST_PATH=./nova/tests/unit
          LANGUAGE=en_US
          LC_ALL=en_US.utf-8
+         OS_STDOUT_CAPTURE=1
+         OS_STDERR_CAPTURE=1
+         OS_TEST_TIMEOUT=160
 deps = -r{toxinidir}/test-requirements.txt
 commands =
   find . -type f -name "*.pyc" -delete
@@ -26,13 +29,13 @@ passenv = OS_DEBUG GENERATE_HASHES
 [testenv:py27]
 commands =
     {[testenv]commands}
-    env TEST_OSPROFILER=1 ostestr --regex 'nova.tests.unit.test_profiler'
-    ostestr '{posargs}'
+    env TEST_OSPROFILER=1 stestr run 'nova.tests.unit.test_profiler'
+    stestr run {posargs}
 
 [testenv:py35]
 commands =
     {[testenv]commands}
-    env TEST_OSPROFILER=1 ostestr --regex 'nova.tests.unit.test_profiler'
+    env TEST_OSPROFILER=1 stestr run 'nova.tests.unit.test_profiler'
     bash tools/pretty_tox3.sh '{posargs}'
 
 [testenv:pep8]
@@ -64,7 +67,7 @@ setenv = VIRTUAL_ENV={envdir}
        LANGUAGE=en_US
 commands =
   find . -type f -name "*.pyc" -delete
-  ostestr '{posargs}'
+  stestr run {posargs}
 
 # TODO(gcb) Merge this into [testenv:functional] when functional tests are gating
 # with python 3.5
@@ -87,7 +90,7 @@ setenv = VIRTUAL_ENV={envdir}
        LANGUAGE=en_US
 commands =
   find . -type f -name "*.pyc" -delete
-  ostestr '{posargs}'
+  stestr run {posargs}
 
 [testenv:genconfig]
 commands = oslo-config-generator --config-file=etc/nova/nova-config-generator.conf