fix undefined retries variable when copying etcdctl

[ErikJiang]

What type of PR is this?

/kind bug

What this PR does / why we need it:

TASK [etcdctl_etcdutl : Copy etcdctl and etcdutl binary from docker container] ****************************************************************************************************************************
fatal: [master]: FAILED! => {"msg": "The field 'retries' has an invalid value, which includes an undefined variable. The error was: 'etcd_retries' is undefined. 'etcd_retries' is undefined

The error appears to be in '/kubespray/roles/etcdctl_etcdutl/tasks/main.yml': line 2, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

---
- name: Copy etcdctl and etcdutl binary from docker container
  ^ here
"}

The etcd_retries parameter is not defined in etcdctl_etcdutl role. As far as I know, this variable is only defined in etcd role.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Fix undefined retries variable when copying etcdctl

[yankay]

Thanks @ErikJiang

The CI has been repaired, would you please repush it to trige the CI agiain :-)
/lgtm

[mzaian]

Thanks @ErikJiang for the fix

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ErikJiang, mzaian

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[yankay]

/lgtm