Switch to stestr

According to Openstack summit session [1],
stestr is maintained project to which all Openstack projects should migrate.
Let's switch to stestr as other projects have already moved to it.

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

Change-Id: I66bf2f094d30ca5da972f27945dcc0108a13abad

.gitignore

@@ -15,5 +15,5 @@ doc/source/api/
 *.egg
 .autogenerated
 .coverage
-.testrepository/
+.stestr/
 .tox/

.stestr.conf

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

.testr.conf

@@ -1,4 +0,0 @@
-[DEFAULT]
-test_command=OS_STDOUT_CAPTURE=1 OS_STDERR_CAPTURE=1 ${PYTHON:-python} -m subunit.run discover -t ./ ./shaker/tests $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list

test-requirements.txt

@@ -10,5 +10,5 @@ oslotest>=1.10.0 # Apache-2.0
 sphinx>=1.5.1 # BSD
 sphinxcontrib-httpdomain # BSD
 sphinx_rtd_theme
-testrepository>=0.0.18 # Apache-2.0/BSD
+stestr>=2.0.0 # Apache-2.0
 testtools>=1.4.0 # MIT

tox.ini

@@ -12,7 +12,7 @@ setenv = VIRTUAL_ENV={envdir}
          LC_ALL=C
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = python setup.py testr --testr-args='{posargs}'
+commands = stestr run {posargs}
 
 [testenv:pep8]
 commands = flake8
@@ -26,7 +26,13 @@ whitelist_externals = bash
 commands = bash -c "find {toxinidir} -type f -not -wholename \*.tox/\* -and \( -name \*.sh -or -name \*rc -or -name functions\* -or \( -wholename lib/\* -and -not -name \*.md \) \) -print0 | xargs -0 bashate -v"
 
 [testenv:cover]
-commands = python setup.py testr --coverage --testr-args='{posargs}'
+setenv =
+    PYTHON=coverage run --source $project --parallel-mode
+commands =
+    stestr run '{posargs}'
+    coverage combine
+    coverage html -d cover
+    coverage xml -o cover/coverage.xml
 
 [testenv:genconfig]
 # When shaker is setup in develop mode it results in 2 packages: shaker and pyshaker