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Automatic merge from submit-queue (batch tested with PRs 50103, 49677, 49449, 43586, 48969) Adding IPv6 to cidr_set and cidr_set_test **What this PR does / why we need it**: This allows IPv6 in cidr_set Currently cidr_set only supports IPv4. This adds IPv6 compatibility and adds IPv6 unit tests. **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #43588 **Special notes for your reviewer**: The IPv6 code here makes some assumptions. The subnets should be at least /64. (maximum 64 bits of prefix) The subnet mask size cannot be greater than 30 more than the cluster mask size. **Release note**: ```release-note ```