Fix TemplateSyntaxError in the server-side filetring of node list views

The server-side filtering had two bugs:
* the ip_address is not always available for all nodes
* the fileds used for filtering were not always strings

In addition, I replaced the obsolete glyphicons icon with a Font
Awesome icon for filter.

Change-Id: I21f4ba835b536d1a179d1af696c2619f25692cc7

tuskar_ui/api/node.py

@@ -652,8 +652,12 @@ class Node(base.APIResourceWrapper):
 
     @cached_property
     def ip_address(self):
-        return (self.instance._apiresource.addresses['ctlplane'][0]
-                ['addr'])
+        try:
+            apiresource = self.instace._apiresource
+        except AttributeError:
+            LOG.error("Couldn't obtain IP address")
+            return None
+        return apiresource.addresses['ctlplane'][0]['addr']
 
     @cached_property
     def image_name(self):

tuskar_ui/infrastructure/nodes/tables.py

@@ -111,11 +111,12 @@ class NodeFilterAction(tables.FilterAction):
         q = filter_string.lower()
 
         def comp(node):
-            return any(q in attr for attr in
-                       (node.ip_address,
-                        node.cpus,
-                        node.memory_mb,
-                        node.local_gb,))
+            return any(q in unicode(value).lower() for value in (
+                node.ip_address,
+                node.cpus,
+                node.memory_mb,
+                node.local_gb,
+            ))
 
         return filter(comp, nodes)
 

tuskar_ui/infrastructure/templates/horizon/common/_data_table_table_actions.html

@@ -13,7 +13,7 @@
           <input class="form-control" value="{{ filter.filter_string|default:'' }}" type="text" name="{{ filter.get_param_name }}" />
           <span class="input-group-btn">
             <button class="btn btn-default" type="submit" {{ filter.attr_string|safe }}>
-              <span class="glyphicon glyphicon-search"></span>
+              <span class="fa fa-lg fa-filter"></span>
             </button>
           </span>
         </div>