Coverage calculation improvements

- add .coveragerc to configure coverage calculations and omissions;
- add python 2.x specific test requirements to coverage tox env;
- update .gitignore.

Change-Id: Idc35e4f18ec297506576f09e468ab34e8704c0b1

.coveragerc

@@ -0,0 +1,8 @@
+[run]
+branch = True
+source = taskflow
+omit = taskflow/tests/*,taskflow/openstack/*,taskflow/test.py
+
+[report]
+ignore-errors = True
+

.gitignore

@@ -26,6 +26,8 @@ pip-log.txt
 .tox
 nosetests.xml
 .venv
+cover
+.testrepository
 
 # Translations
 *.mo

tox.ini

@@ -38,6 +38,9 @@ deps = -r{toxinidir}/requirements.txt
 commands = pylint
 
 [testenv:cover]
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+       -r{toxinidir}/test-2.x-requirements.txt
 commands = python setup.py testr --coverage --testr-args='{posargs}'
 
 [testenv:venv]