Fix for NameError (#39665)

Issue : NameError: global name ‘cnos_devicerules’ is not defined. while running cnos modules. 
Device Rule file validates the range and type of data going into each CLI based on device type it is executed against.
This has to be backported to 2.5

lib/ansible/module_utils/network/cnos/cnos.py

@@ -35,8 +35,8 @@ import time
 import socket
 import re
 try:
-    import cnos_errorcodes
-    import cnos_devicerules
+    from ansible.module_utils.network.cnos import cnos_errorcodes
+    from ansible.module_utils.network.cnos import cnos_devicerules
     HAS_LIB = True
 except:
     HAS_LIB = False