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/open-cas-loader

@@ -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 subprocess
 import time
 import opencas