Properly compare object references for Hosts when adding new ones

Fixes #13397

lib/ansible/inventory/dir.py

@@ -192,6 +192,8 @@ class InventoryDirectory(object):
         if group.name not in self.groups:
             # it's brand new, add him!
             self.groups[group.name] = group
+        # the Group class does not (yet) implement __eq__/__ne__,
+        # so unlike Host we do a regular comparison here
         if self.groups[group.name] != group:
             # different object, merge
             self._merge_groups(self.groups[group.name], group)
@@ -200,7 +202,10 @@ class InventoryDirectory(object):
         if host.name not in self.hosts:
             # Papa's got a brand new host
             self.hosts[host.name] = host
-        if self.hosts[host.name] != host:
+        # because the __eq__/__ne__ methods in Host() compare the
+        # name fields rather than references, we use id() here to
+        # do the object comparison for merges
+        if id(self.hosts[host.name]) != id(host):
             # different object, merge
             self._merge_hosts(self.hosts[host.name], host)