Reset sriov_numvfs to 0 before leapp upgrade

Leapp's actor persistentnetnamesconfig will try
to apply the nic names based on the mac address.
Whlie collecting the data, leapp will also add the
VFs details to RHEL7 catalog (leapp.db). But when
RHEL8 ramfs boots, it will not find the VF interfaces.
VFs will be configured using sriov_config service
on boot (not applied during upgrade). Remove VFs
before leapp upgrade as a workaround.
Closes-Bug: #1890769

Change-Id: I5054d5970e6c88cf3cdcd9c3850ef926040bc827

deployment/neutron/neutron-sriov-agent-container-puppet.yaml

@@ -220,4 +220,33 @@ outputs:
                 - []
       metadata_settings:
         get_attr: [NeutronBase, role_data, metadata_settings]
-      upgrade_tasks: []
+      upgrade_tasks:
+        - name: upgrade prepare for leapp to remove extra sriov vfs
+          tags:
+            - never
+            - system_upgrade
+            - system_upgrade_prepare
+          when:
+            - step|int == 3
+            - upgrade_leapp_enabled
+          block:
+            - name: reset all vfs as leapp will look for all interfaces on reboot
+              shell: |
+                for item in $(find /sys/class/net/ -type l); do
+                    DEVPATH="$item/device/sriov_numvfs"
+                    if [ -f $DEVPATH ]; then
+                      NUM_VFS=$(cat $DEVPATH)
+                      if [[ $NUM_VFS != 0 ]]; then
+                        echo 0 >$DEVPATH
+                      fi
+                    fi
+                done
+            - name: remove sriov_config service for leapp upgrade
+              file:
+                path: "/etc/systemd/system/sriov_config.service"
+                state: absent
+              register: sriov_config_remove_result
+            - name: reload systemd daemon after removing sriov_config service
+              systemd:
+                daemon-reload: yes
+              when: sriov_config_remove_result['changed']