Fix for cnos.py utility file for Python3.5 (#21750)

* fix in cnos.py utility file

* fix compile errors in cnos.py, update module short description in cnos_vlan.py, move vlan roles under integration/roles

* corrections in readme

* Change module directory name to Lenovo

* change import cnos statement

lib/ansible/modules/network/lenovo/cnos_vlan.py

@@ -30,7 +30,7 @@ ANSIBLE_METADATA = {'status': ['preview'],
 DOCUMENTATION = '''
 ---
 module: cnos_vlan
-short_description: Performs VLAN switch configuration and state management.
+short_description: Manage VLAN resources and attributes on devices running Lenovo CNOS
 description:
     - This module allows you to work with VLAN related configurations. The
      operators used are overloaded to ensure control over switch VLAN
@@ -196,7 +196,7 @@ import time
 import re
 
 try:
-    import cnos
+    from ansible.module_utils import cnos
     HAS_LIB = True
 except:
     HAS_LIB = False