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: If0f21e37a5d9b43c0f9491d306167d2656c137f9

.coveragerc

@@ -1,7 +1,8 @@
 [run]
 branch = True
-source = serialization
-omit = serialization/tests/*,serialization/openstack/*
+source = oslo_serialization
+omit = oslo_serialization/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_serialization --testr-args='{posargs}'
 
 [flake8]
 # H803 skipped on purpose per list discussion.
@@ -42,4 +42,4 @@ exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build
 # 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_serialization* --ignore-module=pkg_resources --ignore-file=oslo_serialization/test.py --ignore-file=oslo_serialization/tests/* oslo_serialization
+commands = pip-missing-reqs -d --ignore-module=oslo_serialization* --ignore-module=pkg_resources --ignore-file=oslo_serialization/test.py --ignore-file=oslo_serialization/tests/* oslo_serialization