Merge pull request #67328 from cofyc/fix65113-2

Automatic merge from submit-queue (batch tested with PRs 66916, 67252, 67794, 67619, 67328). 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>.

Using a fixed set of locks, then we don't need to free unused locks anymore.

**What this PR does / why we need it**:

Using a fixed set of locks, then we don't need to free unused locks anymore.
See kubernetes/kubernetes/pull/66442 for discussions.

**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 #65113

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

/assign @msau42 
/assign @thockin

hack/.golint_failures

@@ -377,7 +377,6 @@ pkg/util/initsystem
 pkg/util/ipconfig
 pkg/util/iptables
 pkg/util/iptables/testing
-pkg/util/keymutex
 pkg/util/labels
 pkg/util/mount
 pkg/util/netsh/testing