Fix cleanup of auto egress IPs when deleting a NetNamespace #18547
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When deleting a NetNamespace, we weren't cleaning up all of the state correctly because we tried to make use of a struct field after its value had been cleared, meaning that complicated sequences of egress IP operations could result in junk rules getting added to OVS.
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1543786