Return an error while adding nodes if duplicate chassis id is detected #4739
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While multiple nodes gets same chassis id, POD to POD connectivity between newly added node and all other existing nodes gets impacted due to several missing OVN flows and OpenFlows.
Chassis ID is generally obtained from /etc/openvswitch/system-id.conf and this file gets created while starting up Opevswitch. While the chances of duplicate Openvswitch system ID created for multiple nodes is very thin but not impossible.
This commit returns an error if duplicate chassis id is detected while adding a new node.
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