Additional feature enhancements to nxos_logging (#45844)

* Various changes to nxos_logging.  Plus added purge capibility.

* Made a few new nxapi_logging test cases conditional based on version
and/or platform.

* Addressed PR comments and ansibot shippable.  Fixed up nxos_logging documentation format.

* Addressed ansibot shippable issues with whitespaces and documentation.

* Resolved ansibot codestyle trailing whitespace

lib/ansible/module_utils/network/nxos/nxos.py

@@ -224,6 +224,24 @@ class Cli:
         self._module._capabilities = json.loads(capabilities)
         return self._module._capabilities
 
+    def read_module_context(self, module_key):
+        connection = self._get_connection()
+        try:
+            module_context = connection.read_module_context(module_key)
+        except ConnectionError as exc:
+            self._module.fail_json(msg=to_text(exc, errors='surrogate_then_replace'))
+
+        return module_context
+
+    def save_module_context(self, module_key, module_context):
+        connection = self._get_connection()
+        try:
+            connection.save_module_context(module_key, module_context)
+        except ConnectionError as exc:
+            self._module.fail_json(msg=to_text(exc, errors='surrogate_then_replace'))
+
+        return None
+
 
 class Nxapi:
 
@@ -238,6 +256,7 @@ class Nxapi:
         self._module = module
         self._nxapi_auth = None
         self._device_configs = {}
+        self._module_context = {}
 
         self._module.params['url_username'] = self._module.params['username']
         self._module.params['url_password'] = self._module.params['password']
@@ -464,6 +483,17 @@ class Nxapi:
         result['network_api'] = 'nxapi'
         return result
 
+    def read_module_context(self, module_key):
+        if self._module_context.get(module_key):
+            return self._module_context[module_key]
+
+        return None
+
+    def save_module_context(self, module_key, module_context):
+        self._module_context[module_key] = module_context
+
+        return None
+
 
 def is_json(cmd):
     return str(cmd).endswith('| json')
@@ -589,3 +619,13 @@ def get_interface_type(interface):
         return 'nve'
     else:
         return 'unknown'
+
+
+def read_module_context(module):
+    conn = get_connection(module)
+    return conn.read_module_context(module._name)
+
+
+def save_module_context(module, module_context):
+    conn = get_connection(module)
+    return conn.save_module_context(module._name, module_context)