When we disable ipv6 in IPI baremetal clusters nodes become NotReady.

Since this jira ticket users should be able to disable ipv6 in worker nodes:
https://issues.redhat.com/browse/OCPBUGS-32278

    

Using IPI on Baremetal.
Flexy template:  private-templates/functionality-testing/aos-4_17/ipi-on-baremetal/versioned-installer-packet_libvirt-bootstrap_static-ci 


    

Always
    

    1. Create a MC to disable ipv6 in worker nodes
    
    apiVersion: machineconfiguration.openshift.io/v1
    kind: MachineConfig
    metadata:
      labels:
        machineconfiguration.openshift.io/role: worker
      name: mco-tc-73309-disable-ipv6-cb8p53sy
    spec:
      config:
        ignition:
          version: 3.4.0
      kernelArguments:
        - ipv6.disable=1

    
    

When the configuration is applied to the first worker node it cannot join the cluster anymore

We can see that its network is not configured

$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq master ovs-system state UP group default qlen 1000
    link/ether 06:97:a8:1d:89:83 brd ff:ff:ff:ff:ff:ff
    altname enp0s5
3: ovs-system: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 7a:5c:c5:8f:4b:b0 brd ff:ff:ff:ff:ff:ff
4: genev_sys_6081: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 65000 qdisc noqueue master ovs-system state UNKNOWN group default qlen 1000
    link/ether 9e:73:62:3b:72:95 brd ff:ff:ff:ff:ff:ff
5: ovn-k8s-mp0: <BROADCAST,MULTICAST> mtu 8901 qdisc noop state DOWN group default qlen 1000
    link/ether 3e:b0:95:b5:f1:50 brd ff:ff:ff:ff:ff:ff
6: br-int: <BROADCAST,MULTICAST> mtu 8901 qdisc noop state DOWN group default qlen 1000
    link/ether 56:79:c8:45:c7:18 brd ff:ff:ff:ff:ff:ff
7: br-ex: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc noqueue state UNKNOWN group default qlen 1000
    link/ether 06:97:a8:1d:89:83 brd ff:ff:ff:ff:ff:ff
    inet 10.0.59.78/19 brd 10.0.63.255 scope global dynamic noprefixroute br-ex
       valid_lft 2206sec preferred_lft 2206sec

    

Ipv6 should be disabled in the worker nodes without problems
    

It only happens in 4.17, it does not happen in 4.16