Additional hook_clone_access_alter() bugs

Problem/Motivation

og_moderation_clone_access_alter() was not completely fixed. The following bugs remain:

• It only works for node entity groups, although any entity type can be made a group.
• It only checks the first group that a node is assigned to, although a node may be assigned to multiple groups.
• It only works if the og_group field is named og_group_ref, although the og_group field may have any name, and there can even be multiple og_group fields with different names on the same node.
• The function description says it implements hook_TYPE_alter().
• This is a menu access hook, not a node access hook. There is no reason to use node access constants.

Proposed resolution

Use og_get_entity_groups() to get all a node’s groups regardless of group entity type or og_group field names. Format the function as recommended by hook_clone_access_alter().

Remaining tasks