AC-681 simulating a disabled button for project update and inventory update. Button appears disabled, but tooltips work. On *disabled* buttons tooltip explains why it is disabled. Button is clickable, but nothing happens- just like a real disable dbutton.

awx/ui/static/less/ansible-ui.less

@@ -117,6 +117,15 @@ textarea {
     margin-bottom: 15px;
   }
 
+/* Make button appear to be disabled, but allow mouse events */
+  .btn-disabled {
+    opacity: 0.65;
+    filter: alpha(opacity=65);
+    -webkit-box-shadow: none;
+            box-shadow: none;
+  } 
+
+
 hr {
   border-color: #e3e3e3;
 }