nmcli: fix idempotency issue with macvlan (#11551)

* nmcli: fix idempotency issue with macvlan

The nmcli module is not idempotent for macvlan interfaces.

Ansible running in diff mode for a case where the interface in question
already exists:

```
TASK [nm_macvlan : Check macvlan connection] *********************************************************************************
--- before
+++ after
@@ -11,5 +11,5 @@
     "ipv6.method": "disabled",
     "macvlan.mode": "2",
     "macvlan.parent": "eth0",
-    "macvlan.tap": "no"
+    "macvlan.tap": "False"
 }
```
The problem is that `macvlan.tap` isn't treated as boolean option. Fix it.

* Update changelogs/fragments/11551-fix-nmcli-idempotency-for-macvlan.yml

Co-authored-by: Felix Fontein <felix@fontein.de>

---------

Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/11551-fix-nmcli-idempotency-for-macvlan.yml

@@ -0,0 +1,4 @@
+---
+minor_changes:
+  - nmcli - fix idempotency for MAC VLAN interfaces when using ``macvlan.tap``
+    (https://github.com/ansible-collections/community.general/pull/11551).

plugins/modules/nmcli.py

@@ -2357,6 +2357,7 @@ class Nmcli:
             "ipv6.ignore-auto-routes",
             "802-11-wireless.hidden",
             "team.runner-fast-rate",
+            "macvlan.tap",
         }:
             return bool
         elif setting in {