Fix the xep_0009 import (no more relatives)

Also, remove trailing spaces in all files
of this plugin

sleekxmpp/plugins/xep_0009/stanza/RPC.py

@@ -14,55 +14,51 @@ class RPCQuery(ElementBase):
     name = 'query'
     namespace = 'jabber:iq:rpc'
     plugin_attrib = 'rpc_query'
-    interfaces = set(())    
+    interfaces = set(())
     subinterfaces = set(())
     plugin_attrib_map = {}
     plugin_tag_map = {}
 
 
-
 class MethodCall(ElementBase):
     name = 'methodCall'
     namespace = 'jabber:iq:rpc'
     plugin_attrib = 'method_call'
-    interfaces = set(('method_name', 'params'))    
+    interfaces = set(('method_name', 'params'))
     subinterfaces = set(())
     plugin_attrib_map = {}
-    plugin_tag_map = {}        
-
+    plugin_tag_map = {}
 
     def get_method_name(self):
         return self._get_sub_text('methodName')
 
     def set_method_name(self, value):
         return self._set_sub_text('methodName', value)
-    
+
     def get_params(self):
         return self.xml.find('{%s}params' % self.namespace)
-    
+
     def set_params(self, params):
         self.append(params)
-        
 
-        
+
 class MethodResponse(ElementBase):
     name = 'methodResponse'
     namespace = 'jabber:iq:rpc'
     plugin_attrib = 'method_response'
-    interfaces = set(('params', 'fault'))    
+    interfaces = set(('params', 'fault'))
     subinterfaces = set(())
     plugin_attrib_map = {}
     plugin_tag_map = {}
-    
-    
+
     def get_params(self):
         return self.xml.find('{%s}params' % self.namespace)
-    
+
     def set_params(self, params):
         self.append(params)
 
     def get_fault(self):
         return self.xml.find('{%s}fault' % self.namespace)
-    
+
     def set_fault(self, fault):
         self.append(fault)

sleekxmpp/plugins/xep_0009/stanza/__init__.py

@@ -6,4 +6,4 @@
     See the file LICENSE for copying permission.
 """
 
-from RPC import RPCQuery, MethodCall, MethodResponse
+from sleekxmpp.plugins.xep_0009.stanza.RPC import RPCQuery, MethodCall, MethodResponse