Use abspath instead of realpath for group/host vars files

The use of realpath means when following symlinks the actual path is
used when loading these files in the VariableManager, which may not
line up with the host or group name specified.

Fixes #14545

lib/ansible/inventory/__init__.py

@@ -739,11 +739,11 @@ class Inventory(object):
 
             if group and host is None:
                 # load vars in dir/group_vars/name_of_group
-                base_path = os.path.realpath(os.path.join(to_unicode(basedir, errors='strict'), "group_vars/%s" % group.name))
+                base_path = os.path.abspath(os.path.join(to_unicode(basedir, errors='strict'), "group_vars/%s" % group.name))
                 results = combine_vars(results, self._variable_manager.add_group_vars_file(base_path, self._loader))
             elif host and group is None:
                 # same for hostvars in dir/host_vars/name_of_host
-                base_path = os.path.realpath(os.path.join(to_unicode(basedir, errors='strict'), "host_vars/%s" % host.name))
+                base_path = os.path.abspath(os.path.join(to_unicode(basedir, errors='strict'), "host_vars/%s" % host.name))
                 results = combine_vars(results, self._variable_manager.add_host_vars_file(base_path, self._loader))
 
         # all done, results is a dictionary of variables for this particular host.