fix coverage script from masking unit test failures (#265)

* add 'set -e' line to fail on error

* create Unmarshal method for DefaultSecRule

* fix portsbinding 'update' unit test

* go fmt

* remove line from debugging
diff --git a/openstack/compute/v2/images/results.go b/openstack/compute/v2/images/results.go
index a55b8f1..1090327 100644
--- a/openstack/compute/v2/images/results.go
+++ b/openstack/compute/v2/images/results.go
@@ -45,7 +45,7 @@
 	Status   string
 
 	Updated string
-	
+
 	Metadata map[string]string
 }