Fix bond-slave honoring MTU (#8118)

The bond-slave type should honor the request
MTU value.

changelogs/fragments/8118-fix-bond-slave-honoring-mtu.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - nmcli - allow setting ``MTU`` for ``bond-slave`` interface types (https://github.com/ansible-collections/community.general/pull/8118).

plugins/modules/nmcli.py

@@ -1952,6 +1952,7 @@ class Nmcli(object):
     def mtu_conn_type(self):
         return self.type in (
             'bond',
+            'bond-slave',
             'dummy',
             'ethernet',
             'infiniband',