Merge pull request #62639 from shyamjvs/autocalculate-allowed-num-nodes-unready

Automatic merge from submit-queue (batch tested with PRs 62407, 62602, 62539, 62639, 62647). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Autocalculate ALLOWED_NOTREADY_NODES based on NUM_NODES

As an alternative for https://github.com/kubernetes/test-infra/pull/7698

/cc @wojtek-t

```release-note
NONE
```
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Kubernetes Submit Queue 2018-04-16 08:55:18 -07:00 committed by GitHub
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@ -66,6 +66,10 @@ if [[ "${NODE_OS_DISTRIBUTION}" == "debian" ]]; then
NODE_ACCELERATORS=""
fi
# To avoid failing large tests due to some flakes in starting nodes, allow
# for a small percentage of nodes to not start during cluster startup.
ALLOWED_NOTREADY_NODES="${ALLOWED_NOTREADY_NODES:-$((NUM_NODES / 100))}"
# By default a cluster will be started with the master and nodes
# on Container-optimized OS (cos, previously known as gci). If
# you are updating the os image versions, update this variable.