Show wait spinner after submit of wizard modal

Upon submitting a wizard modal, such as Launch Instance,
the modal remains open and the submit button is disabled.
This patch puts a spinner in the submit button as well to
show that work is going on in the background.

Note: Jenkins keeps failing due to firefox issues, so I'm
trying a different download link to see if it helps.

Change-Id: Ie800d9cc635d6b92af600e0bfe6846c70b6ca065
Closes-Bug: #1461641

horizon/static/framework/widgets/wizard/wizard.html

@@ -85,7 +85,10 @@
     <button type="button" class="btn btn-primary finish"
       ng-click="viewModel.onClickFinishBtn()"
       ng-disabled="wizardForm.$invalid||viewModel.isSubmitting">
-      <span ng-class="::viewModel.btnIcon.finish||'fa fa-check'"></span>
+      <span class="fa"
+        ng-class="viewModel.isSubmitting ? 'fa-spinner fa-spin' : 
+          (viewModel.btnIcon.finish || 'fa-check')">
+      </span>
       <span ng-bind="::viewModel.btnText.finish"></span>
     </button>
   </div>

openstack_dashboard/dashboards/project/static/dashboard/project/workflow/launch-instance/launch-instance-workflow.service.js

@@ -120,7 +120,7 @@
       },
 
       btnIcon: {
-        finish: 'fa fa-cloud-upload'
+        finish: 'fa-cloud-upload'
       }
     });
   }