[Multi-NIC]EgressIP was not correctly reassigned when label/unlabel egress node

[Multi-NIC]EgressIP was not correctly reassigned when label/unlabel egress node

Tested PR openshift/cluster-network-operator#1969,openshift/ovn-kubernetes#1832
together

1.  Label worker-0 node as egress node, and create one egressip object
# oc get egressip
NAME         EGRESSIPS      ASSIGNED NODE   ASSIGNED EGRESSIPS
egressip-1   172.22.0.100   worker-0        172.22.0.100

2. Create another egressIP object, the egressIP located on  worker-0  as well.
# oc get egressip
NAME         EGRESSIPS      ASSIGNED NODE   ASSIGNED EGRESSIPS
egressip-1   172.22.0.100   worker-0        172.22.0.100
egressip-2   172.22.0.101   worker-0        172.22.0.101

3. Checked secondary NIC on egress node, the two IPs were correctly added
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:da:86:9b:3e:ac brd ff:ff:ff:ff:ff:ff
    inet 172.22.0.86/24 brd 172.22.0.255 scope global dynamic noprefixroute enp1s0
       valid_lft 96sec preferred_lft 96sec
    inet 172.22.0.100/32 scope global enp1s0ovn
       valid_lft forever preferred_lft forever
    inet 172.22.0.101/32 scope global enp1s0ovn
       valid_lft forever preferred_lft forever
    inet6 fe80::2da:86ff:fe9b:3eac/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

4. Label another node worker-1 as egress node
5. Delete egressip-2 and recreated it, egressip-2 is on worker-1  
# oc get egressip
NAME         EGRESSIPS      ASSIGNED NODE   ASSIGNED EGRESSIPS
egressip-1   172.22.0.100   worker-0        172.22.0.100
egressip-2   172.22.0.101   worker-1        172.22.0.101
6. Unlabel egress from worker-1, 172.22.0.101 was reassigned to  worker-0 
# oc get egressip
NAME         EGRESSIPS      ASSIGNED NODE   ASSIGNED EGRESSIPS
egressip-1   172.22.0.100   worker-0        172.22.0.100
egressip-2   172.22.0.101   worker-0        172.22.0.101

7, Check the  worker-0's and  worker-1' secondary NIC
3.

EgressIP was not removed from worker-1
# oc debug node/worker-1
Starting pod/worker-1-debug-pw7xk ...
To use host binaries, run `chroot /host`
Pod IP: 192.168.111.24
If you don't see a command prompt, try pressing enter.
sh-4.4# ip a show enp1s0
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:da:86:9b:3e:b0 brd ff:ff:ff:ff:ff:ff
    inet 172.22.0.90/24 brd 172.22.0.255 scope global dynamic noprefixroute enp1s0
       valid_lft 115sec preferred_lft 115sec
    inet 172.22.0.101/32 scope global enp1s0ovn
       valid_lft forever preferred_lft forever
    inet6 fe80::2da:86ff:fe9b:3eb0/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

172.22.0.100 was missed from worker-0
# oc debug node/worker-0
Starting pod/worker-0-debug-8nz5f ...
To use host binaries, run `chroot /host`
Pod IP: 192.168.111.23
If you don't see a command prompt, try pressing enter.
sh-4.4# ip a show enp1s0
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:da:86:9b:3e:ac brd ff:ff:ff:ff:ff:ff
    inet 172.22.0.86/24 brd 172.22.0.255 scope global dynamic noprefixroute enp1s0
       valid_lft 68sec preferred_lft 68sec
    inet 172.22.0.101/32 scope global enp1s0ovn
       valid_lft forever preferred_lft forever
    inet6 fe80::2da:86ff:fe9b:3eac/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

The egressIP should be correctly reassigned to correct egress node