Fix up recursive safe delete rbac and add unit test

awx/main/access.py

@@ -386,6 +386,9 @@ class HostAccess(BaseAccess):
             raise ParseError('Cannot associate two items from different inventories')
         return True
 
+    def can_delete(self, obj):
+        return obj and self.user.can_access(Inventory, 'delete', obj.inventory)
+
 class GroupAccess(BaseAccess):
     '''
     I can see groups whenever I can see their inventory.
@@ -439,6 +442,10 @@ class GroupAccess(BaseAccess):
                 return False
         return True
 
+    def can_delete(self, obj):
+        return obj and self.user.can_access(Inventory, 'delete', obj.inventory)
+
+
 class InventorySourceAccess(BaseAccess):
     '''
     I can see inventory sources whenever I can see their group or inventory.