text: Title: Include pod /etc/hosts in ephemeral storage calculation for eviction
  Body: **What type of PR is this?**
  /kind bug
  
  **What this PR does / why we need it**:
  Includes a pod /etc/hosts when calculating a pod's ephemeral storage usage to decide whether to evict the pod.
  
  **Which issue(s) this PR fixes**:
  N/A
  
  **Does this PR introduce a user-facing change?**:
  ```release-note
  CVE-2020-8557 (Medium): Node-local denial of service via container /etc/hosts file. See https://github.com/kubernetes/kubernetes/issues/93032 for more details.
  ```
  
  **Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.**:
  
  ```docs
  
  ```