aarch64/centos8: no fluentd, rabbitmq, kolla-toolbox

AArch64 lacks Erlang in CentOS 8 - we have to wait for 8.2 release to
get it. So no RabbitMQ for us.

And no Fluentd.

Change-Id: I266cdfa09efcba1c54efaa3c16ffe556808b3673

kolla/image/build.py

@@ -175,10 +175,13 @@ UNBUILDABLE_IMAGES = {
 
     'centos+aarch64': {
         "elasticsearch",  # no binary package
+        "fluentd",        # no binary package
         "hacluster-pcs",  # no binary package
         "influxdb",       # no binary package
         "kibana",         # no binary package
+        "kolla-toolbox",  # no Erlang package
         "mongodb",        # no binary package
+        "rabbitmq",       # no Erlang package
         "telegraf",       # no binary package
     },
 

releasenotes/notes/centos8-aarch64-not-part-of-release-330893c1f7d5f394.yaml

@@ -0,0 +1,5 @@
+---
+issues:
+  - |
+    AArch64 images using CentOS as base system are not supported in Ussuri.
+    This will be fixed later in release cycle as we need CentOS 8.2 release.