quantumclient.common.serializer module cleanup

Remove unused methods in quantumclient.common.serializer.XMLDeserializer
that tries to access non existing attributes of xml node:
* find_first_child_named
* extract_text
* find_children_named

Change-Id: I0aff5933fa75e50748e9d0325d898c2f6836fa58
Fixes: bug #1132850

quantumclient/common/serializer.py

@@ -321,27 +321,6 @@ def _from_xml_node(self, node, listnames):
                     child, listnames)
             return result
 
-    def find_first_child_named(self, parent, name):
-        """Search a nodes children for the first child with a given name"""
-        for node in parent.childNodes:
-            if node.nodeName == name:
-                return node
-        return None
-
-    def find_children_named(self, parent, name):
-        """Return all of a nodes children who have the given name"""
-        for node in parent.childNodes:
-            if node.nodeName == name:
-                yield node
-
-    def extract_text(self, node):
-        """Get the text field contained by the given node"""
-        if len(node.childNodes) == 1:
-            child = node.childNodes[0]
-            if child.nodeType == child.TEXT_NODE:
-                return child.nodeValue
-        return ""
-
     def default(self, datastring):
         return {'body': self._from_xml(datastring)}