Coverage: test_cpio: add a test for CpioFileCompat
Coverage: test_cpio: add a test for CpioFileCompat

Coverage change:
xcp.cpiofile: 58.1% -> 62.1%
total: 63.9% -> 65.2%

Signed-off-by: Yann Dirson <9a3266eb84fe75b6e4a0d9d8e42ed70b568ec175@vates.fr>

xenserver/python-libs,xenserver/python-libs