Use a variable for roles of remove-node/post-remove

[ydFu]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This replace all hard-coding of 'remove-node/post-remove' with the new default variable.
This had two advantages:

• consistent use of default variable, 'remove-node/pre-remove' is also like this.
• more readable ansible code,and avoid hard-coding.

Which issue(s) this PR fixes:

NONE

Special notes for your reviewer:

If there is a unified variable naming method, tell me and I will adjust it later.

Does this PR introduce a user-facing change?:

Add variables (`delete_node_retries`,`delete_node_delay_seconds`) to tweak remove node process

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[floryut]

/ok-to-test

@ydFu Thank you

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, ydFu

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[ydFu]

/assign @cristicalin

Thanks for your advice

[oomichi]

/lgtm