Translate python2 to python3

*opencas.py*: changed result class to contain text values instead of bytes,
translated chache configuring methods to py3,
*init script*: changed regex input on raw string to work in py3.

Signed-off-by: Slawomir_Jankowski <slawomir.jankowski@intel.com>

utils/casctl

@@ -1,10 +1,9 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 #
 # Copyright(c) 2012-2019 Intel Corporation
 # SPDX-License-Identifier: BSD-3-Clause-Clear
 #
 
-from __future__ import print_function
 import argparse
 import sys
 import re
@@ -42,7 +41,7 @@ def add_core_recursive(core, config):
             .format(core.device, core.cache_id))
         exit(3)
     core.marked = True
-    match = re.match('/dev/cas(\d)-(\d).*', core.device)
+    match = re.match(r'/dev/cas(\d)-(\d).*', core.device)
     if match:
         cache_id,core_id = match.groups()
         with_error = add_core_recursive(config.caches[int(cache_id)].cores[int(core_id)], config)