Switch to using stestr

According to Openstack summit session [1] stestr is
maintained project to which all Openstack projects
should migrate.
Let's switch it then.

[1] https://etherpad.openstack.org/p/YVR-python-pti

Change-Id: I2fdbbafb9ec36c7bcbab6038387aaa31f41316dd
Signed-off-by: Charles Short <zulcss@gmail.com>

.gitignore

@@ -2,8 +2,8 @@
 *.swp
 *.log
 .tox
-.testrepository/
 vendor/*
 Gemfile.lock
 packstack.egg-info
-releasenotes/build
+releasenotes/build
+.stestr

.stestr.conf

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

test-requirements.txt

@@ -1,7 +1,7 @@
 sphinx>=1.6.2  # BSD
 openstackdocstheme>=1.17.0  # Apache-2.0
 reno>=0.1.1 # Apache2
-os-testr>=0.4.1 # Apache-2.0
+stestr>=1.0.0 # Apache-2.0
 coverage
 hacking!=0.13.0,<0.14,>=0.12.0
 mock>=2.0 # BSD

tox.ini

@@ -13,7 +13,7 @@ setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = /usr/bin/find . -type f -name "*.pyc" -delete
-           ostestr {posargs}
+           stestr run {posargs}
 
 [tox:jenkins]
 sitepackages = True