Update xos-tosca to use nose2 for testing

Change-Id: I74575310d3611f75da22532f668437c302cf4a29
diff --git a/unittest.cfg b/unittest.cfg
new file mode 100644
index 0000000..f7d64b7
--- /dev/null
+++ b/unittest.cfg
@@ -0,0 +1,7 @@
+[unittest]
+plugins=nose2.plugins.junitxml
+
+[coverage]
+always-on = True
+coverage-report = term
+coverage-report = xml