Fix coverage configuration and execution

A number of configuration errors prevent the successful creation of code
coverage. This corrects the .coveragerc source/omit setup and the tox
package name generation.

http://lists.openstack.org/pipermail/openstack-dev/2015-October/076193.html

Change-Id: I2ee48d5b987cc26fe2de6d538ab278821100b278

.coveragerc

@@ -1,7 +1,8 @@
 [run]
 branch = True
-source = middleware
-omit = middleware/tests/*,middleware/openstack/*
+source = oslo_middleware
+omit = oslo_middleware/tests/*
 
 [report]
 ignore_errors = True
+precision = 2

.gitignore

@@ -23,6 +23,7 @@ pip-log.txt
 
 # Unit test / coverage reports
 .coverage
+cover
 .tox
 nosetests.xml
 .testrepository
@@ -48,4 +49,4 @@ ChangeLog
 
 # Editors
 *~
-.*.swp
+.*.swp

tox.ini

@@ -26,7 +26,7 @@ commands = {posargs}
 commands = python setup.py build_sphinx
 
 [testenv:cover]
-commands = python setup.py testr --coverage --testr-args='{posargs}'
+commands = python setup.py test --coverage --coverage-package-name=oslo_middleware --testr-args='{posargs}'
 
 [flake8]
 # H803 skipped on purpose per list discussion.
@@ -45,4 +45,4 @@ import_exceptions = oslo_middleware._i18n
 # this also means that pip-missing-reqs must be installed separately, outside
 # of the requirements.txt files
 deps = pip_missing_reqs
-commands = pip-missing-reqs -d --ignore-module=oslo_middleware* --ignore-module=pkg_resources --ignore-file=oslo_middleware/tests/* oslo_middleware
+commands = pip-missing-reqs -d --ignore-module=oslo_middleware* --ignore-module=pkg_resources --ignore-file=oslo_middleware/tests/* oslo_middleware