UI error overlay fixes

- Correct css selector for error overlay title header
- Display vm create errors as critical

snf-app/synnefo/ui/static/snf/js/models.js

@@ -1841,7 +1841,7 @@
             opts = {name: name, imageRef: image.id, flavorRef: flavor.id, metadata:meta}
             opts = _.extend(opts, extra);
 
-            this.api_call(this.path, "create", {'server': opts}, undefined, undefined, callback, {critical: false});
+            this.api_call(this.path, "create", {'server': opts}, undefined, undefined, callback, {critical: true});
         }
 
     })

snf-app/synnefo/ui/static/snf/js/ui/web/ui_error_view.js

@@ -240,7 +240,7 @@
                 title = this.title || this.type + " Error";
             }
 
-            this.$(".header .title").text(title);
+            this.$(".overlay-header .title").text(title);
             this.$(".error-code").text(this.code || "");
             this.$(".error-type").text(this.type || "");
             this.$(".error-module").text(this.ns || "");