[PR #6649/994f08b3 backport][stable-7] MH VarsMixin deprecation (#6656)

MH VarsMixin deprecation (#6649)

* MH VarsMixin deprecation

* add changelog frag

(cherry picked from commit 994f08b37a)

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

changelogs/fragments/6649-varsmixin-deprecation.yml

@@ -0,0 +1,2 @@
+deprecated_features:
+  - MH VarsMixin module utils - deprecates ``VarsMixin`` and supporting classes in favor of plain ``vardict`` module util (https://github.com/ansible-collections/community.general/pull/6649).

plugins/module_utils/mh/mixins/vars.py

@@ -11,6 +11,13 @@ import copy
 
 
 class VarMeta(object):
+    """
+    DEPRECATION WARNING
+
+    This class is deprecated and will be removed in community.general 10.0.0
+    Modules should use the VarDict from plugins/module_utils/vardict.py instead.
+    """
+
     NOTHING = object()
 
     def __init__(self, diff=False, output=True, change=None, fact=False):
@@ -60,6 +67,12 @@ class VarMeta(object):
 
 
 class VarDict(object):
+    """
+    DEPRECATION WARNING
+
+    This class is deprecated and will be removed in community.general 10.0.0
+    Modules should use the VarDict from plugins/module_utils/vardict.py instead.
+    """
     def __init__(self):
         self._data = dict()
         self._meta = dict()
@@ -123,7 +136,12 @@ class VarDict(object):
 
 
 class VarsMixin(object):
+    """
+    DEPRECATION WARNING
 
+    This class is deprecated and will be removed in community.general 10.0.0
+    Modules should use the VarDict from plugins/module_utils/vardict.py instead.
+    """
     def __init__(self, module=None):
         self.vars = VarDict()
         super(VarsMixin, self).__init__(module)