Description of problem:

It is not possible to change v4TransitSwitchSubnet in OVN when there is a collision with other networks in the infrastructure.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:

1. Install a cluster with SDN with the network 100.88.0.0/16

2. Try to change from SDN to OVN

Actual results:

Switching to ovn gives error because there is collision between networks and there is no way to modify the v4TransitSwitchSubnet of OVN

Expected results:

It is expected to be possible to modify the v4TransitSwitchSubnet just as it is possible to modify the v4InternalSubnet.

Additional info:

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