remove tar error message #1
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when you use this comand:kubectl cp kube-system/etcd-master:/usr/local/bin/etcdctl /etcdctl,it will return "tar: removing leading '/' from member names" message.Because tar default use relative path.And It's run BusyBox,does't support "-P" option. So I remove the prefix of "/".
```
Nick-Mac:kubectl nick$ ./kubectl --kubeconfig=/Users/nick/gocode/src/k8s.io/kubernetes/cmd/kube-scheduler/admin.conf --v=4 cp kube-system/etcd-master:/usr/local/bin/etcdctl /Users/nick/Downloads/etcdctl
tar: invalid option -- P
BusyBox v1.29.3 (2018-10-01 22:37:18 UTC) multi-call binary.
Usage: tar c|x|t [-zJjahmvokO] [-f TARFILE] [-C DIR] [-T FILE] [-X FILE] [--exclude PATTERN]... [FILE]...
Create, extract, or list files from a tar file
c Create
x Extract
t List
-f FILE Name of TARFILE ('-' for stdin/out)
-C DIR Change to DIR before operation
-v Verbose
-O Extract to stdout
-m Don't restore mtime
-o Don't restore user:group
-k Don't replace existing files
-z (De)compress using gzip
-J (De)compress using xz
-j (De)compress using bzip2
-a (De)compress using lzma
-h Follow symlinks
-T FILE File with names to include
-X FILE File with glob patterns to exclude
--exclude PATTERN Glob pattern to exclude
F0704 12:16:26.917437 45945 helpers.go:114] command terminated with exit code 1
```
> /kind bug
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**What this PR does / why we need it**:
**Which issue(s) this PR fixes**:
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Fixes kubernetes#79764
**Special notes for your reviewer**:
**Does this PR introduce a user-facing change?**:
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```release-note
remove tar error message
```
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when you use this comand:kubectl cp kube-system/etcd-master:/usr/local/bin/etcdctl /etcdctl,it will return "tar: removing leading '/' from member names" message.Because tar default use relative path.And It's run BusyBox,does't support "-P" option. So I remove the prefix of "/".
What this PR does / why we need it:
Which issue(s) this PR fixes:
Fixes kubernetes#79764
Special notes for your reviewer:
Does this PR introduce a user-facing change?: