Automatic merge from submit-queue (batch tested with PRs 63417, 64249, 64242, 64128, 64275). 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>.
fix bugs that break processing when printing errors occur in kubectl
**What this PR does / why we need it**:
The process should continue when error happens, this patch fix the problem
**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**:
**Release note**:
```release-note
NONE
```
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>.
Allow env from resource with keys & updated tests
**What this PR does / why we need it**:
This change allows users to pull environment from specific keys in secrets and configmaps using the `kubectl set env` command. User can provide a list of comma-separated keys with the `--keys` flag.
This can be useful when a number of applications want to share a configuration object but don't want to pollute a resource with unused environment
Improves test coverage of set env command
**Release note**:
```
Allow kubectl set env to specify which keys to import from a resource
```
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>.
move updatepodspecforobject out of factory
Updating a podspec is a polymorphic helper, but it isn't a factory method.
@kubernetes/sig-cli-maintainers
/assign @juanvallejo
```release-note
NONE
```
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>.
Allow env to be updated via specific key in resource
**What this PR does / why we need it**:
This change allows users of the `oc` client to specify a list of comma-separated keys when running `oc set env` which should be imported from a resource i.e configmap or secret
This can be useful when a number of applications want to share a configuration object but don't want to pollute a resource with unused environment
**Release note**:
```release-note
Allow kubectl env to specify which keys to import from a config map
```
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>.
remove mapper dependency for cmdutil.Factory#PrintSuccess
**Release note**:
```release-note
NONE
```
Part of a series of patches removing printing stack dependency on mappings the rest mapper
**Before**
```
$ kubectl label pod/my-pod label=label
pod "my-pod" labeled
```
**After**
```
$ kubectl label pod/my-pod label=label
pods "my-pod" labeled
```
cc @deads2k
