e8701e6746
Automatic merge from submit-queue (batch tested with PRs 48092, 47894, 47983)
fix systemd service file for custom args.
`KUBE_SCHEDULER_ARGS` and `KUBELET_ARGS` are used to custom args for scheduler or kubelet by users.
But if there are more than one params in `KUBELET_ARGS`, for example, if I set KUBELET_ARGS="--cgroups-per-qos=false --enforce-node-allocatable=", the kubelet will judge the `false --enforce-node-allocatable=` as the value of `cgroups-per-qos`. Because `${KUBELET_ARGS}` in kubelet.service will expands the variable into one word. And if I take `$KUBELET_ARGS` instead, kubelet will worker perfectly.
For more info, please click [EnvironmentFiles and support for /etc/sysconfig files](http://fedoraproject.org/wiki/Packaging:Systemd#EnvironmentFiles_and_support_for_.2Fetc.2Fsysconfig_files). This bug is reported by @huanxingyouyoutoo. And I make this PR for her to fix it.
**Release note**:
```
NONE
```
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Kubernetes
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