[zuul] Add firewall flush rules to zuul pre-update gates

Change-Id: I6295d55338a6a75ac43b54c092704670d61854d9

tools/gate/playbooks/osh-infra-upgrade-host.yaml

@@ -35,10 +35,12 @@
     - upgrade-host
     - start-zuul-console
     - disable-local-nameserver
+    - setup-firewall
   tags:
     - upgrade-host
     - start-zuul-console
     - disable-local-nameserver
+    - setup-firewall
 
 - hosts: all
   vars_files:

tools/gate/playbooks/roles/setup-firewall/tasks/main.yaml

@@ -0,0 +1,29 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# NOTE(portdirect): This needs refinement but drops the firewall on zuul nodes
+---
+- name: deploy iptables packages
+  include_role:
+    name: deploy-package
+    tasks_from: dist
+  vars:
+    packages:
+      deb:
+        - iptables
+      rpm:
+        - iptables
+- command: iptables -S
+- command: iptables -F
+- command: iptables -P INPUT ACCEPT
+- command: iptables -S
+...