Add support to fallback from ENI PD if subnet is out of /28 prefixes #286
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When a subnet is very fragmented, there might not be enough free contiguous IPs to make up a /28 block. Without this fallback, new node creation would be blocked when PD is enabled and subnet is in this state. Currently operator does not support PD in mixed mode. Once a node has secondary IP addresses attached on the ENI, operator will not attempt to allocate any more prefixes. Signed-off-by: Hemanth Malla <hemanth.malla@datadoghq.com>
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1.10 backport of cilium#20822