Stub out required functions for redis cache

Without these functions the masters are
not able to use the redis cache completely

Signed-off-by: Carson Anderson <ca@carsonoid.net>

salt/cache/redis_cache.py

@@ -115,7 +115,7 @@ from salt.exceptions import SaltCacheError
 
 __virtualname__ = 'redis'
 __func_alias__ = {
-    'list_': 'list'
+    'ls': 'list'
 }
 
 log = logging.getLogger(__file__)
@@ -145,6 +145,9 @@ def __virtual__():
 # helper functions -- will not be exported
 # -----------------------------------------------------------------------------
 
+def init_kwargs(kwargs):
+    return {}
+
 
 def _get_redis_cache_opts():
     '''
@@ -415,7 +418,7 @@ def flush(bank, key=None):
     return True
 
 
-def list_(bank):
+def ls(bank):
     '''
     Lists entries stored in the specified bank.
     '''