[metallb] add config option for IPAddressPool avoidBuggyIPs (#10458)

* Add avoid_buggy_ips as optional
* Revert avoid_buggy_ips default back to false
* Change auto_assign to optional, default true

docs/metallb.md

@@ -73,7 +73,6 @@ metallb_config:
     primary:
       ip_range:
         - 192.0.1.0-192.0.1.254
-      auto_assign: true
 
     pool1:
       ip_range:
@@ -82,8 +81,8 @@ metallb_config:
 
     pool2:
       ip_range:
-        - 192.0.2.2-192.0.2.2
-      auto_assign: false
+        - 192.0.3.0/24
+      avoid_buggy_ips: true # When set to true, .0 and .255 addresses will be avoided.
 ```
 
 ## Layer2 Mode

roles/kubernetes-apps/metallb/templates/pools.yaml.j2

@@ -16,7 +16,7 @@ spec:
 {% for ip_range in pool.ip_range %}
   - "{{ ip_range }}"
 {% endfor %}
-  autoAssign: {{ pool.auto_assign }}
-  avoidBuggyIPs: true
+  autoAssign: {{ pool.auto_assign | default(true) }}
+  avoidBuggyIPs: {{ pool.avoid_buggy_ips | default(false) }}
 
 {% endfor %}