nmcli: Add 'slave-type bridge' to nmcli command if type is bridge-slave (#2409) (#2422)

(cherry picked from commit b5f8ae4320)

Co-authored-by: spike77453 <spike77453@users.noreply.github.com>

changelogs/fragments/2409-nmcli_add_slave-type_bridge_to_nmcli_command_if_type_is_bridge-slave.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - nmcli - if type is ``bridge-slave`` add ``slave-type bridge`` to ``nmcli`` command (https://github.com/ansible-collections/community.general/issues/2408).

plugins/modules/net_tools/nmcli.py

@@ -752,6 +752,7 @@ class Nmcli(object):
             })
         elif self.type == 'bridge-slave':
             options.update({
+                'connection.slave-type': 'bridge',
                 'bridge-port.path-cost': self.path_cost,
                 'bridge-port.hairpin-mode': self.hairpin,
                 'bridge-port.priority': self.slavepriority,

tests/unit/plugins/modules/net_tools/test_nmcli.py

@@ -223,6 +223,7 @@ TESTCASE_BRIDGE_SLAVE_SHOW_OUTPUT = """\
 connection.id:                          non_existent_nw_device
 connection.interface-name:              br0_non_existant
 connection.autoconnect:                 yes
+connection.slave-type:                  bridge
 ipv4.never-default:                     no
 bridge-port.path-cost:                  100
 bridge-port.hairpin-mode:               yes