Remove unused dict functions from utils

These aren't used any more.

Change-Id: Iffb4954691c288c2729171182fd5ee21f8613d2b

nova/utils.py

@@ -410,12 +410,6 @@ def get_my_linklocal(interface):
         raise exception.NovaException(msg)
 
 
-def str_dict_replace(s, mapping):
-    for s1, s2 in mapping.iteritems():
-        s = s.replace(s1, s2)
-    return s
-
-
 class LazyPluggable(object):
     """A pluggable backend loaded lazily based on some value."""
 
@@ -524,44 +518,6 @@ def get_from_path(items, path):
         return get_from_path(results, remainder)
 
 
-def flatten_dict(dict_, flattened=None):
-    """Recursively flatten a nested dictionary."""
-    flattened = flattened or {}
-    for key, value in dict_.iteritems():
-        if hasattr(value, 'iteritems'):
-            flatten_dict(value, flattened)
-        else:
-            flattened[key] = value
-    return flattened
-
-
-def partition_dict(dict_, keys):
-    """Return two dicts, one with `keys` the other with everything else."""
-    intersection = {}
-    difference = {}
-    for key, value in dict_.iteritems():
-        if key in keys:
-            intersection[key] = value
-        else:
-            difference[key] = value
-    return intersection, difference
-
-
-def map_dict_keys(dict_, key_map):
-    """Return a dict in which the dictionaries keys are mapped to new keys."""
-    mapped = {}
-    for key, value in dict_.iteritems():
-        mapped_key = key_map[key] if key in key_map else key
-        mapped[mapped_key] = value
-    return mapped
-
-
-def subset_dict(dict_, keys):
-    """Return a dict that only contains a subset of keys."""
-    subset = partition_dict(dict_, keys)[0]
-    return subset
-
-
 def diff_dict(orig, new):
     """
     Return a dict describing how to change orig to new.  The keys