ip-config: Fix the nmcli docs for the renamed dhcp-send-hostname

In nmcli we have renamed dhcp-send-hostname and dhcp-send-hostname-v2 to
dhcp-send-hostname-deprecated and dhcp-send-hostname so users don't need
to worry about the details of the weird workarounds that we sometimes
need to do to expand and/or deprecate some properties.

However, the autogenerated documentation didn't include this names. Add
---nmcli--- specific documentation, adding a new property-infos field
called "rename" with the new name used in nmcli. This field can be used
for more properties if we use the same strategy in the future.

tools/generate-docs-nm-property-infos.py

@@ -164,6 +164,7 @@ KEYWORD_XML_TYPE_ATTR = "attr"
 keywords = collections.OrderedDict(
     [
         ("property", KEYWORD_XML_TYPE_ATTR),
+        ("rename", KEYWORD_XML_TYPE_ATTR),
         ("variable", KEYWORD_XML_TYPE_ATTR),
         ("format", KEYWORD_XML_TYPE_ATTR),
         ("values", KEYWORD_XML_TYPE_ATTR),

tools/generate-docs-nm-settings-docs-merge.py

@@ -300,6 +300,7 @@ for setting_name in iter_keys_of_dicts(settings_roots, key_fcn_setting_name):
         node_set_attr(property_node, "special-values", properties_attrs)
         node_set_attr(property_node, "default", properties_attrs)
         node_set_attr(property_node, "alias", properties_attrs)
+        node_set_attr(property_node, "rename", properties_attrs)
 
         if description_docbook is not None:
             property_node.insert(0, description_docbook)