lib/test-driver: fix reading command output for other distros #382260
Success
Attempted: nixosTests.nat.firewall, nixosTests.networking.scripted.link, nixosTests.installer.simpleProvided, nixosTests.installer.separateBootFat, nixosTests.networking.scripted.virtual, nixosTests.keymap.azerty, nixosTests.keymap.dvorak-programmer, nixosTests.boot-stage1, nixosTests.installer.swraid, nixosTests.keymap.neo, nixosTests.nfs4.simple, nixosTests.i3wm, nixosTests.udisks2, nixosTests.networking.networkd.loopback, nixosTests.containers-ip, nixosTests.ecryptfs, nixosTests.login, nixosTests.installer.simpleLabels, nixosTests.php.httpd, nixosTests.zfs.installer, nixosTests.predictable-interface-names.unpredictable, nixosTests.predictable-interface-names.unpredictableNetworkd, nixosTests.mutableUsers
The following builds were skipped because they don't evaluate on x86_64-linux: nixosTests.printing
Details
Partial log
/nix/store/d6ldqal6dr6hm3l4ci85dvfvhblgjkf0-vm-test-run-Loopback-Networking-Networkd
/nix/store/93f0z9xrl3f8ig0x9z0wwpgpjrby5a7r-vm-test-run-containers-ipv4-ipv6
/nix/store/8b06dn3jjbaxl9d2szpljrzwx2vi0a1g-vm-test-run-ecryptfs
/nix/store/1dnhqkqrh93rd8xmf43q76an6995fczq-vm-test-run-login
/nix/store/jqnmddkdldyamxvf2cnbwmci5hj64hqz-vm-test-run-installer-simpleLabels
/nix/store/2pm5cxrljhk1z0hv7xmihrhlng4qs31d-vm-test-run-php-8.3.16-httpd-test
/nix/store/9dmzqdzgwypzivscdxgbzmb9fjhcllca-vm-test-run-installer-zfs-root
/nix/store/jadfjv501xck70577l9hvavqjb0j89m3-vm-test-run-unpredictableInterfaceNames
/nix/store/jfj1psy4f91vj57yiama0m33fqm0ib4r-vm-test-run-unpredictableInterfaceNames-with-networkd
/nix/store/a4161gc3v4ip4c5lsn906gz8ncybl1zg-vm-test-run-mutable-users