[OVN][migration] Fix cleanup stage for DVR case and fips

When removing interfaces like <int>@if<index> need to consider only
<int> part.

Related-Prod: https://mirantis.jira.com/browse/PRODX-50806
Change-Id: Ic3ac2b80cdacf346d40c29959b64805cefdde689

Author: mkarpin

rockoon/cli/ovs_ovn_migration.py

@@ -527,6 +527,7 @@ def cleanup_linux_netns(script_args):
     EXIT_CODE=0
     for ns in $(egrep 'qrouter-|qdhcp-|snat-|fip-' <(cut -d' ' -f1 <($IP_NETNS))); do
         for link in $(cut -d: -f2 <(grep -v LOOPBACK <($IP_NETNS exec $ns ip -o link show))); do
+            link=${link%%@*}
             $IP_NETNS exec $ns ip l delete $link || ovs-vsctl ${OVS_DB_SOCK} --if-exists del-port br-int $link
         done
         if [[ -n $(grep -v LOOPBACK <($IP_NETNS exec $ns ip -o link show)) ]]; then