kmstest: Support specifying property values in percents

If the property is a string that ends with a '%' character, treat it as
a percentage of the range reported by the property and convert it to the
corresponding numerical value.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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