Whereabouts leaks IP assignment causing duplicate IPs in OCP 4.18

Issue

• In a cluster using the Whereabouts CNI plugin, different pods are assigned the same IP address after a node reboots. This leads to network connectivity issues due to duplicate IPs.

• For example, two different pods show the same IP address 192.20.131.18 on one of their interfaces:

Pod 1:

$ oc rsh -n ns pod1
sh-4.2$ ip add
...
3: svc-sigk-l: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1800 qdisc noqueue state UP group default qlen 1000
    link/ether XX:XX:XX:96:e8:72 brd ff:ff:ff:ff:ff:ff
    inet 192.20.131.18/24 brd 192.20.131.255 scope global svc-sigk-l
       valid_lft forever preferred_lft forever
...

Pod 2:

$ oc rsh -n ns pod2
sh-4.2$ ip add
...
3: svc-sigk-l: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1800 qdisc noqueue state UP group default qlen 1000
    link/ether XX:XX:XX:dd:d3:09 brd ff:ff:ff:ff:ff:ff
    inet 192.20.131.18/24 brd 192.20.131.255 scope global svc-sigk-l
       valid_lft forever preferred_lft forever
...