[Backport-0.13] Use endpoints from Broker while validating overlapping CIDRs #964
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As part of the following PR[1], we no longer sync an endpoint from the Broker if the endpoint has any overlapping CIDRs with the local cluster. This was done to avoid issues on the Gateway node. Consequently, the subctl diagnose code should ideally examine the endpoints on Broker when validating overlapping CIDRs instead of inspecting the endpoints on the local cluster. This PR addresses this issue.
[1] submariner-io/submariner#2263