Debian: Fix sw-manager commands

sw-manager strategy creation commands trigger
a python3 error.  The issue is that python2 supports
a string, but python3 expects bytes.

The fix is to send the appropriate message
based on the whether we are in python2 or python3.

Test Plan:
  Debian:  verify sw-manager patch-strategy create works
  Centos:  verify sw-manager patch-strategy create works

Closes-Bug: 1974475
Signed-off-by: Al Bailey <al.bailey@windriver.com>
Change-Id: I94800fa870f1a444df6e95ba2f206803a4acfc18

nfv/nfv-common/nfv_common/schedule/_schedule_module.py

@@ -3,6 +3,7 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 #
+import six
 import socket
 
 from nfv_common import selobj
@@ -13,6 +14,12 @@
 _receive_socket = None
 _pending_function_calls = list()
 
+if six.PY3:
+    # python3 requires the string be converted to bytes
+    MESSAGE_ONE = '1'.encode('utf-8')
+else:
+    MESSAGE_ONE = '1'
+
 
 def schedule_function_call(func, *args, **kwargs):
     """
@@ -22,7 +29,7 @@ def schedule_function_call(func, *args, **kwargs):
 
     function_data = (func, args, kwargs)
     _pending_function_calls.append(function_data)
-    _send_socket.send('1')
+    _send_socket.send(MESSAGE_ONE)
 
 
 @coroutine