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: Ia337cd014d4130f60a88fc988eabcc85d9142834

.coveragerc

@@ -1,7 +1,8 @@
 [run]
 branch = True
-source = test
-omit = test/tests/*,test/openstack/*
+source = oslotest
+omit = oslotest/tests/*
 
 [report]
-ignore-errors = True
+ignore_errors = True
+precision = 2

.gitignore

@@ -23,6 +23,7 @@ pip-log.txt
 
 # Unit test / coverage reports
 .coverage
+cover
 .tox
 nosetests.xml
 .testrepository

tox.ini

@@ -15,7 +15,7 @@ commands = flake8
 [testenv:cover]
 setenv = VIRTUAL_ENV={envdir}
 commands =
-  python setup.py testr --coverage
+  python setup.py test --coverage --testr-args='{posargs}'
 
 [testenv:venv]
 commands = {posargs}