Backport: Support diagnose tunnel on previous Submariner releases #1507
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With some minor changes to the code, we will be able to support running
subctl diagnose tunnel command on previous Submariner releases where
NAT discovery is not enabled (or NAT discovery is still in progress).
Signed-Off-by: Sridhar Gaddam sgaddam@redhat.com
(cherry picked from commit 5e5126c)