Use stestr for running unit tests, add a coverage environment

stestr [1] is a fork of the testrunner python test runner.

Coverage tests can be run using 'tox -e cover'.

Adds a job for checking coverage to Zuul check and gate.

[1] http://stestr.readthedocs.io/en/latest/

Change-Id: I25cd407677a4013d022f87d124c6db43ab6bb2e0
Story: #2001637
Task: #6648

.coveragerc

@@ -0,0 +1,6 @@
+[run]
+branch = True
+source = kayobe
+
+[report]
+ignore_errors = True

.gitignore

@@ -26,6 +26,9 @@ cover/
 .coverage*
 !.coveragerc
 .tox
+nosetests.xml
+.testrepository
+.stestr
 .venv
 
 # Mr Developer

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=${TESTS_DIR:-./kayobe/tests/unit/}
+top_dir=./

test-requirements.txt

@@ -11,3 +11,4 @@ hacking>=0.12.0,<0.13 # Apache-2.0
 molecule<3 # MIT
 oslotest>=1.10.0 # Apache-2.0
 sphinx>=1.5.1 # BSD
+stestr # Apache-2.0

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.0
-envlist = py34,py27,pypy,pep8
+envlist = py35,py27,pep8
 skipsdist = True
 
 [testenv]
@@ -13,9 +13,11 @@ whitelist_externals =
 setenv =
    VIRTUAL_ENV={envdir}
    PYTHONWARNINGS=default::DeprecationWarning
-   TESTS_DIR=./kayobe/tests/unit/
+   OS_STDOUT_CAPTURE=1
+   OS_STDERR_CAPTURE=1
+   OS_TEST_TIMEOUT=60
 deps = -r{toxinidir}/test-requirements.txt
-commands = unit2 discover {posargs}
+commands = stestr run {posargs}
 
 [testenv:pep8]
 commands =
@@ -80,6 +82,18 @@ commands =
             -not -name idrac-bootstrap.yml) \
         {posargs}"
 
+[testenv:cover]
+setenv =
+    VIRTUAL_ENV={envdir}
+    PYTHON=coverage run --source kayobe --parallel-mode
+commands =
+    coverage erase
+    stestr run {posargs}
+    coverage combine
+    coverage report
+    coverage html -d cover
+    coverage xml -o cover/coverage.xml
+
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
 

zuul.d/project.yaml

@@ -5,6 +5,7 @@
         - openstack-tox-pep8
         - openstack-tox-py27
         - openstack-tox-py35
+        - openstack-tox-cover
         - build-openstack-sphinx-docs
         - kayobe-tox-ansible-syntax
         - kayobe-tox-ansible
@@ -15,6 +16,7 @@
         - openstack-tox-pep8
         - openstack-tox-py27
         - openstack-tox-py35
+        - openstack-tox-cover
         - build-openstack-sphinx-docs
         - kayobe-tox-ansible-syntax
         - kayobe-tox-ansible