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add pod UID
**What this PR does / why we need it**:
Add pod UID. The test passes but we'll get error info when run with `GOFLAGS=-v`:
```
E0723 09:18:18.393249 45452 node_info.go:477] Cannot get pod key, err: Cannot get cache key for pod with empty UID
E0723 09:18:18.393440 45452 node_info.go:490] Cannot get pod key, err: Cannot get cache key for pod with empty UID
```
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
4e0a60a44c