loadbalancer_sg: nil-check subnet.Extract result

[SAY-5]

Closes #3101. subnets.Get(...).Extract() can return nil with no error in some openstack misconfigurations; subnet.CIDR then SIGSEGVs the OCCM service worker into CrashLoopBackOff.

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• aba0c73 loadbalancer_sg: nil-check subnet.Extract result

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