Tests

tests: Fix whiteout test #1857

Job	Run time
build-integration	7m 5s
Build (Fedora)	1m 40s
Code style	52s
Build - FCOS minimal	1m 53s
Build (C9S)	2m 19s
Debian Stable with sign-ed25519 and FUSE 2	9m 3s
Debian Stable with curl, sign-ed25519, no gpgme, FUSE 3	7m 51s
Debian Stable 32 bit	9m 14s
Debian Stable without libsystemd	8m 39s
Debian Testing	9m 0s
Debian Testing with libsoup3	8m 11s
Debian stable + static-prepareroot	8m 29s
Ubuntu Latest Release	10m 47s
Privileged testing	45s
	1h 25m 48s

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