coordinator: rework GetDefaultRouteInterface to get pod's default route nic #3302
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What this PR does / why we need it:
Which issue(s) this PR fixes:
Fixes #3296
Special notes for your reviewer:
In IPv6 mode, a non-existent network card is set through PodDefaultRouteNIC, but the Pod has an IPv6 default route, but a null value is returned, thus skipping the synchronization of the default route and making the Pod successfully created. However, the creation should fail at this time and prompt "net2 don't exist in pod"