Updates tox.ini's cover environment

The openstack-tox-cover job expects a coverage report at the end.
This patch updates the cover environment in tox.ini, bringing it
in line with the other repos.

This also adds stestr in test-requirements, which is needed by the
new coverage env.

Finally, removes the cloudbaseinit import from releasenotes.
According to [1], a project shouldn't necessarely be installed
in order to build its releasenotes.

[1] http://lists.openstack.org/pipermail/openstack-dev/2017-November/124480.html

Change-Id: I77dfe57f1190fc62f7bd19284e2c86d55bb1804a

.coveragerc

@@ -0,0 +1,2 @@
+[run]
+omit = */cloudbaseinit/tests/resources/*

.stestr.conf

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

releasenotes/source/conf.py

@@ -67,11 +67,10 @@ bug_tag = ''
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-from cloubaseinit import version
+# Release notes are version independent, no need to set version and release.
+version = ""
 # The full version, including alpha/beta/rc tags.
-release = version.get_version()
-# The short X.Y version.
-version = version.get_canonical_version()
+release = ""
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

test-requirements.txt

@@ -6,6 +6,7 @@ sphinx
 oslosphinx
 testtools>=0.9.32
 testrepository>=0.0.18
+stestr>=2.0.0
 openstackdocstheme>=1.11.0  # Apache-2.0
 # releasenotes
 reno>=1.8.0 # Apache-2.0

tox.ini

@@ -22,7 +22,16 @@ commands = flake8 {posargs}
 commands = bash tools/lintstack.sh
 
 [testenv:cover]
-commands = python setup.py testr --coverage --testr-args='{posargs}'
+basepython = python2.7
+setenv =
+  {[testenv]setenv}
+  PYTHON=coverage run --source cloudbaseinit --parallel-mode
+commands =
+  stestr run --no-subunit-trace {posargs}
+  coverage combine
+  coverage report --fail-under=82 --skip-covered
+  coverage html -d cover
+  coverage xml -o cover/coverage.xml
 
 [testenv:venv]
 commands = {posargs}