Ansible 2.3 feature support for dellos9 and dellos10 (#22856)

* Ansible 2.3 feature support for dellos9 and dellos10
* Use Persistent Connection Manager

* Fix CI issue, revert the doc and metadata changes

* Reverted the meta_info (supported_by) to community from core

* Fixed the CI issues, use module_utisl.six and updated legacy-files

lib/ansible/modules/network/dellos9/dellos9_config.py

@@ -201,9 +201,12 @@ saved:
   sample: True
 
 """
+from ansible.module_utils.basic import AnsibleModule
 from ansible.module_utils.netcfg import NetworkConfig, dumps
-from ansible.module_utils.network import NetworkModule
 from ansible.module_utils.dellos9 import get_config, get_sublevel_config
+from ansible.module_utils.dellos9 import dellos9_argument_spec, check_args
+from ansible.module_utils.dellos9 import load_config, run_commands
+from ansible.module_utils.dellos9 import WARNING_PROMPTS_RE
 
 
 def get_candidate(module):
@@ -237,10 +240,11 @@ def main():
         backup=dict(type='bool', default=False)
     )
 
+    argument_spec.update(dellos9_argument_spec)
+
     mutually_exclusive = [('lines', 'src')]
 
-    module = NetworkModule(argument_spec=argument_spec,
-                           connect_on_load=False,
+    module = AnsibleModule(argument_spec=argument_spec,
                            mutually_exclusive=mutually_exclusive,
                            supports_check_mode=True)
 
@@ -248,7 +252,11 @@ def main():
 
     match = module.params['match']
     replace = module.params['replace']
-    result = dict(changed=False, saved=False)
+
+    warnings = list()
+    check_args(module, warnings)
+
+    result = dict(changed=False, saved=False, warnings=warnings)
 
     candidate = get_candidate(module)
 
@@ -257,15 +265,18 @@ def main():
         if parents:
             contents = get_sublevel_config(config, module)
             config = NetworkConfig(contents=contents, indent=1)
+        else:
+            config = NetworkConfig(contents=config, indent=1)
         configobjs = candidate.difference(config, match=match, replace=replace)
 
     else:
         configobjs = candidate.items
 
     if module.params['backup']:
-        result['__backup__'] = module.cli('show running-config')[0]
+        result['__backup__'] = get_config(module)
 
     commands = list()
+
     if configobjs:
         commands = dumps(configobjs, 'commands')
         commands = commands.split('\n')
@@ -277,11 +288,11 @@ def main():
             commands.extend(module.params['after'])
 
         if not module.check_mode and module.params['update'] == 'merge':
-            response = module.config.load_config(commands)
-            result['responses'] = response
+            load_config(module, commands)
 
             if module.params['save']:
-                module.config.save_config()
+                cmd = {'command': 'copy runing-config startup-config', 'prompt': WARNING_PROMPTS_RE, 'answer': 'yes'}
+                run_commands(module, [cmd])
                 result['saved'] = True
 
         result['changed'] = True