test/py: efi_capsule: test for FMP versioning

This test covers the FMP versioning for both raw and FIT image,
and both signed and non-signed capsule update.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>