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bind alpha feature network plugin flags correctly

**What this PR does / why we need it**:
When working #63542, I found the flags, like `--cni-conf-dir` and `cni-bin-dir`, were not correctly bound.

**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**:
/cc kubernetes/sig-node-pr-reviews

**Release note**:

```release-note
None
```