Add coverage reporting

Tox target: cover
Exclude:
    tests
    dummy driver
    migrations
    configs
Report: console and html
Threshold: 65%
Current state: 70%

Change-Id: I3d0bb682ed499167e169789d7a222e8ce4637457

.coveragerc

@@ -0,0 +1,9 @@
+[run]
+source =
+    devops
+omit =
+    devops/tests/*
+    devops/migrations/*
+    devops/driver/dummy/*
+    devops/settings.py
+    devops/test_settings.py

tox.ini

@@ -5,7 +5,7 @@
 
 [tox]
 minversion = 1.6
-envlist = pep8, py{27,34,35}, pylint, pylint-py{27,34,35}
+envlist = pep8, py{27,34,35}, pylint, pylint-py{27,34,35}, cover
 skipsdist = True
 
 [testenv]
@@ -20,6 +20,15 @@ commands =
 [testenv:venv]
 commands = {posargs:}
 
+[testenv:cover]
+deps =
+    pytest-cov
+    -r{toxinidir}/test-requirements.txt
+commands =
+    py.test --cov-config .coveragerc --cov-report html --cov=devops devops/tests
+    coverage report --fail-under 65
+
+
 [testenv:pep8]
 deps = hacking==0.10.1
 usedevelop = False