Adds test coverage in tox.ini

Coverage measurement will be helpful to gauge the effectiveness
of tests and maintain the quality of the code. Also changing
.gitignore to ignore the cover directory and .coverage
directories.

Change-Id: I184210af2d2e677b7cc2fe0c6561334ebc444fad

.gitignore

@@ -28,6 +28,9 @@ pip-log.txt
 pip-delete-this-directory.txt
 
 # Unit test / coverage reports
+cover/
+.coverage*
+!.coveragerc
 htmlcov/
 .tox/
 .coverage

test-requirements.txt

@@ -1,5 +1,6 @@
 mock
 hacking>=0.9.2,<0.10
+coverage>=3.6 # Apache-2.0
 testrepository>=0.0.18
 testtools>=1.4.0 # MIT
 os-testr>=0.4.1 # Apache-2.0

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py34,py27,pep8
+envlist = py34,py27,pep8,cover
 
 [testenv]
 usedevelop = True
@@ -20,6 +20,17 @@ deps =
 commands =
     flake8 proliantutils
 
+[testenv:cover]
+# After running this target, visit proliantutils/htmlcov/index.html
+# in your browser, to see a nicer presentation report with annotated
+# HTML listings detailing missed lines.
+basepython = python2.7
+deps = {[testenv]deps}
+commands = coverage erase
+           python setup.py testr --coverage --testr-args='{posargs}'
+           coverage report --omit=*test*
+           coverage html --omit=*test*
+
 [flake8]
 max-complexity=15