Fix network config line diff ignore (#43924)

* If config is added in form of lines add
  capability to ignore confgiure lines given as input
  in task

lib/ansible/module_utils/network/common/config.py

@@ -374,6 +374,10 @@ class NetworkConfig(object):
         # global config command
         if not parents:
             for line in lines:
+                # handle ignore lines
+                if ignore_line(line):
+                    continue
+
                 item = ConfigLine(line)
                 item.raw = line
                 if item not in self.items:
@@ -399,6 +403,10 @@ class NetworkConfig(object):
 
             # add child objects
             for line in lines:
+                # handle ignore lines
+                if ignore_line(line):
+                    continue
+
                 # check if child already exists
                 for child in ancestors[-1]._children:
                     if child.text == line: