Added coverage tests in tox

Change-Id: I66a56f9480a733a5cfd06abbce6dbffd0e4f80d3
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/.gitignore-common b/.gitignore-common
index 4a339f3..08ca7f0 100644
--- a/.gitignore-common
+++ b/.gitignore-common
@@ -48,3 +48,9 @@
 *.egg-info
 .eggs
 
+# Unit test / coverage reports
+.coverage
+cover
+coverage.xml
+nosetests.xml
+