ceph-volume: improve wipefs retry logic in lvm.zap

ceph-volume: improve wipefs retry logic in lvm.zap

- Simplify the initialization of `tries` and `interval` variables for clarity.
- Adjust the retry logic in the `wipefs` function to:
  - Include the attempt count in the warning message for better debugging.
  - Start the retry loop at 1 and increment up to `tries`.
- Remove unnecessary unpacking of `stdout` and `stderr` since they were unused.
- Update the loop to increment `tries` by 1 to reflect the intended number of attempts.

This change improves code readability and makes retry behavior more transparent.

Signed-off-by: Guillaume Abrioux <gabrioux@ibm.com>