Removed 'default=None' in a batch of modules (#4556) (#4568)

* removed default=None

* removed default=None

* removed default=None

* removed default=None

* added changelog fragment

(cherry picked from commit b916cb369b)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

plugins/modules/cloud/centurylink/clc_group.py

@@ -297,9 +297,9 @@ class ClcGroup(object):
         """
         argument_spec = dict(
             name=dict(required=True),
-            description=dict(default=None),
-            parent=dict(default=None),
-            location=dict(default=None),
+            description=dict(),
+            parent=dict(),
+            location=dict(),
             state=dict(default='present', choices=['present', 'absent']),
             wait=dict(type='bool', default=True))