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>.
Need to validate taint effect when removing taints.
Instead of reporting taint not found, it's better to report user
that the effect is invalid. This will help user to check errors.
So when user tries to remove a taint, two conditions will be checked:
1. Whether or not the effect is an empty string.
2. Whether or not the non-empty effect is a valid taint effect.
**Release note**:
```release-note
None
```
Automatic merge from submit-queue (batch tested with PRs 52485, 52443, 52597, 52450, 51971). 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>..
Some kubelet flags do not accept their default values
Correct the flags and add a round trip test that ensure these do not
break again in the future.
@deads2k as observed when we tried to turn flags into args.
Instead of reporting taint not found, it's better to report user
that the effect is invalid. This will help user to check errors.
So when user tries to remove a taint, two conditions will be checked:
1. Whether or not the effect is an empty string.
2. Whether or not the non-empty effect is a valid taint effect.
Automatic merge from submit-queue (batch tested with PRs 51574, 51534, 49257, 44680, 48836)
Task 1: Tainted node by condition.
**What this PR does / why we need it**:
Tainted node by condition for MemoryPressure, OutOfDisk and so on.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: part of #42001
**Release note**:
```release-note
Tainted nodes by conditions as following:
* 'node.kubernetes.io/network-unavailable=:NoSchedule' if NetworkUnavailable is true
* 'node.kubernetes.io/disk-pressure=:NoSchedule' if DiskPressure is true
* 'node.kubernetes.io/memory-pressure=:NoSchedule' if MemoryPressure is true
* 'node.kubernetes.io/out-of-disk=:NoSchedule' if OutOfDisk is true
```
Automatic merge from submit-queue (batch tested with PRs 50537, 49699, 50160, 49025, 50205)
AddOrUpdateTaint should ignore duplicate Taint.
The parameter of AddOrUpdateTaint is Taint pointer, so should use
Taint object itself to compare with the node's taint list to ignore
duplicate taint.
While doing #49384, found this issue and fixed.
Fixed part of #49384, other test cases will be added in the following patch
**Release note**:
```
None
```
Automatic merge from submit-queue (batch tested with PRs 43275, 45014, 46449, 46488, 46525)
Fix typo
**What this PR does / why we need it**:
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
```
