Migrate from testr to stestr

* Replace .testr.conf by .stestr.conf for migration and update
  .gitignore, tox.ini and test-requirements.txt files accordingly

Signed-off-by: HeroicHitesh <email.hiteshkumar@gmail.com>
Change-Id: Ia577800e7a342beaad58009239a98b9e7044d01a

.gitignore

@@ -1,15 +1,24 @@
-*~
-.testrepository
-*.sw?
 *.pyc
+*.qcow2
+elements/seed-stack-config/local.json
+
+# Unit test / coverage reports
+.stestr
 .tox
+.venv
+
+# Packages
 *.egg-info
 dist
-*.qcow2
 build
+
+# pbr generates these
 AUTHORS
 ChangeLog
-elements/seed-stack-config/local.json
+
+# Editors
+*.sw?
+*~
 
 # Files created by releasenotes build
 releasenotes/build

.stestr.conf

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

.testr.conf

@@ -1,5 +0,0 @@
-[DEFAULT]
-test_command=python -m subunit.run discover . $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list
-

test-requirements.txt

@@ -1,5 +1,5 @@
 hacking>=2.0.0
 
 oslotest
-testrepository>=0.0.18
+stestr>=2.0.0 # Apache-2.0
 pyflakes>=2.2.0

tox.ini

@@ -11,8 +11,7 @@ deps =
     -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/test-requirements.txt
-commands=
-    python setup.py testr --slowest --testr-args='{posargs}'
+commands = stestr run --slowest {posargs}
 
 [testenv:venv]
 commands = {posargs}