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Fix GKE system spec for OS images with kernel version 4.10+
Two changes are required for validating images with kernel version 4.10+.
1. Update the spec in gke.yaml to allow 4.10+ kernel.
2. Update the GKE environment docker validation to allow `CONFIG_DEVPTS_MULTIPLE_INSTANCES` to be missing in >= 4.8 kernel because this option has been removed in 4.8.
**Release note**:
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None
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/assign @dchen1107