Automatic merge from submit-queue. 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>.

Ring buffer for shared informer notifications

**What this PR does / why we need it**:
Improves memory allocation for shared informer listeners. Instead of always appending to the slice use as a ring buffer, avoiding reslice operations as long as there is room in the slice. See https://github.com/kubernetes/kubernetes/pull/47045#issuecomment-317621259 for details. This is a follow up PR for #47045.

Results from BenchmarkListener:
```
Current code (from the #47045):
1000000	      1540 ns/op	     109 B/op	       1 allocs/op
```
```
New code:
1000000	      1162 ns/op	      16 B/op	       1 allocs/op
```

**Special notes for your reviewer**:
Only review the last commit, this branch is based on #47045 PR. I'll rebase onto master once it is merged.

**Release note**:

```release-note
NONE
```
/kind enhancement
/sig api-machinery
/cc @deads2k @ncdc