Adding ChefSpec::Converge to spec_helper.rb

Change-Id: I1e6cc97c4ebdf35e3f023d4c6d9c5be4033aab3d
Addresses: blueprint lint-and-unit-testing-for-havana

spec/spec_helper.rb

@@ -92,3 +92,9 @@ def expect_creates_policy_json(service, user, group, action = :restart) # ruboco
     end
   end
 end
+
+# README(galstrom21): This will remove any coverage warnings from
+#   dependent cookbooks
+ChefSpec::Coverage.filters << '*/openstack-block-storage'
+
+at_exit { ChefSpec::Coverage.report! }