Avoid potential loop_var shadowing

[VannTen]

What type of PR is this? /kind cleanup

What this PR does / why we need it: With CentOS, kubespray currently produces the following warning:

[WARNING]: TASK: bootstrap-os : Enable Oracle Linux repo: The loop variable
'item' is already in use. You should set the `loop_var` value in the
`loop_control` option for the task to something else to avoid variable
collisions and unexpected behavior.

This could bites us in nasty ways, so fix it.

Does this PR introduce a user-facing change?:

NONE

[VannTen]

/assign @mzaian

Re-testing email reply.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MrFreezeex, mzaian, VannTen

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