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Kubernetes Submit Queue 9642104e82 Merge pull request #39914 from kevin-wangzefeng/forgiveness-library-changes

Automatic merge from submit-queue (batch tested with PRs 40696, 39914, 40374)

Forgiveness library changes

**What this PR does / why we need it**:
Splited from #34825, contains library changes that are needed to implement forgiveness:

1. ~~make taints-tolerations matching respect timestamps, so that one toleration can just tolerate a taint for only a period of time.~~ As TaintManager is caching taints and observing taint changes, time-based checking is now outside the library (in TaintManager). see #40355.
2. make tolerations respect wildcard key.
3. add/refresh some related functions to wrap taints-tolerations operation.

**Which issue this PR fixes**: 
Related issue: #1574
Related PR: #34825, #39469 
~~Please note that the first 2 commits in this PR come from #39469 .~~

**Special notes for your reviewer**:

~~Since currently we have `pkg/api/helpers.go` and `pkg/api/v1/helpers.go`, there are some duplicated periods of code laying in these two files.~~

~~Ideally we should move taints-tolerations related functions into a separate package (pkg/util/taints), and make it a unified set of implementations. But I'd just suggest to do it in a follow-up PR after Forgiveness ones done, in case of feature Forgiveness getting blocked to long.~~

**Release note**:

```release-note
make tolerations respect wildcard key
```

2017-02-03 15:05:55 -08:00