network.dpdk: Restart openvswitch-switch for dpdk

Current state of distro packages systemd unit deps (extract):
- dpdk.service wants network-pre.target;
- network-pre.target wants openvswitch-nonetwork.service;
- openvswitch-switch.service wants openvswitch-nonetwork.service,
  network.target;

However, openvswitch-nonetwork requires ports to be bound already,
handled by dpdk service. On system boot, since openvswitch-nonetwork
starts before dpdk (succesfully, despite the binding issue), and the
ulterior start of openvswitch-switch does not trigger a restart, the
system is left in a slightly broken state, fixed by restarting either
of the openvswitch-* services.

To avoid another race condition leading to dead openvswitch-switch,
restart the openvswitch-nonetwork service directly.

Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

linux/network/dpdk.sls

@@ -52,6 +52,16 @@ openvswitch_dpdk_pkgs:
         Requires=dpdk.service
         After=dpdk.service
 
+{# create drop-in dpdk post-start reload of openvswitch-nonetwork #}
+/etc/systemd/system/dpdk.service.d/openvswitch-nonetwork.conf:
+  file.managed:
+    - makedirs: true
+    - require:
+      - pkg: openvswitch_dpdk_pkgs
+    - contents: |
+        [Service]
+        ExecStartPost=/bin/systemctl restart openvswitch-nonetwork
+
 linux_network_dpdk_ovs_service:
   cmd.run:
   - name: "ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true"