save ziplist encoded type as a different type id. Done as separated commit...

save ziplist encoded type as a different type id. Done as separated commit since this is the part that will not merge cleanly in 2.2

src/rdb.c

@@ -406,6 +406,8 @@ int rdbSaveKeyValuePair(FILE *fp, robj *key, robj *val,
     vtype = val->type;
     if (vtype == REDIS_HASH && val->encoding == REDIS_ENCODING_ZIPMAP)
         vtype = REDIS_HASH_ZIPMAP;
+    else if (vtype == REDIS_LIST && val->encoding == REDIS_ENCODING_ZIPLIST)
+        vtype = REDIS_HASH_ZIPLIST;
     /* Save type, key, value */
     if (rdbSaveType(fp,vtype) == -1) return -1;
     if (rdbSaveStringObject(fp,key) == -1) return -1;