Although the following patch has been addressed in Icehouse 2014.1, it
still has not yet been released for Havana.  It has been modified to
apply cleanly into our current Havana implementation

commit 3badd1ffbe8796d27b924f882ed05b8d3f4f0f11
Author: Dan Prince <[email protected]>
Date:   Tue Dec 10 14:51:32 2013 -0500

    Lazy log the fixed_key warnings
    
    Cinder currently spews quite a bit of WARNINGs like this with
    the default settings:
    
    WARNING cinder.keymgr.conf_key_mgr [-] config option keymgr.fixed_key
    has not been defined: some operations may fail unexpectedly
    
    Many users may not be using features that require key manager...
    so logging the WARNING message a bit more lazily seems reasonable.
    
    Change-Id: I5ab72285c7d4bc2ec3196dd94fabf977b3a4ebaf
    Closes-bug: 1252512

diff --git a/cinder/keymgr/conf_key_mgr.py b/cinder/keymgr/conf_key_mgr.py
index f000c44..ee4fbc3 100644
--- cinder-2013.2.3/cinder/keymgr/conf_key_mgr.py.~2~	2014-05-29 11:02:58.846311952 -0700
+++ cinder-2013.2.3/cinder/keymgr/conf_key_mgr.py	2014-05-29 11:02:58.855843284 -0700
@@ -67,9 +67,6 @@
         super(ConfKeyManager, self).__init__()
 
         self.key_id = '00000000-0000-0000-0000-000000000000'
-        if CONF.keymgr.fixed_key is None:
-            LOG.warn(_('config option keymgr.fixed_key has not been defined: '
-                       'some operations may fail unexpectedly'))
 
     def _generate_key(self, **kwargs):
         _hex = self._generate_hex_key(**kwargs)
@@ -78,6 +75,8 @@
 
     def _generate_hex_key(self, **kwargs):
         if CONF.keymgr.fixed_key is None:
+            LOG.warn(_('config option keymgr.fixed_key has not been defined: '
+                       'some operations may fail unexpectedly'))
             raise ValueError(_('keymgr.fixed_key not defined'))
         return CONF.keymgr.fixed_key