Cf garden gvisor support#13288
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7 patches enabling gVisor (runsc) as container runtime for Cloud Foundry Garden on diego-cells: 1. state_file: exact-match container ID lookup before prefix glob 2. state_file: return ErrNotExist for prefix hits that are all children 3. container: skip userns join when host uid 0 is unmapped (gofer EINVAL) 4. sandbox/network: struct-based AddrDel preserving peer/scope/flags 5. sandbox/network: warm ARP cache from live NUD states (not just PERMANENT) 6. config: default overlay2=none so host-side rootfs writes are gofer-visible 7. shim/cmdOutput: use tempfiles instead of pipe buffers (prevents hang on daemonized sandbox inheriting pipe write-end) Tested on Ubuntu 22.04 stemcell (kernel 5.15.0-177) with CF Garden, python/node/go/java/staticfile buildpacks all passing.
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