Merge branch 'cgroup-helpers'

Daniel Borkmann says:

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This adds various straight-forward helper improvements and additions to BPF
cgroup based connect(), sendmsg(), recvmsg() and bind-related hooks which
would allow to implement more fine-grained policies and improve current load
balancer limitations we're seeing. For details please see individual patches.
I've tested them on Kubernetes & Cilium and also added selftests for the small
verifier extension. Thanks!
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Signed-off-by: Alexei Starovoitov <ast@kernel.org>