kola/testiso: Adapt test for mpath name variations

We adjust test to be compatible with both mpath friendly and
non-friendly names.

Author: joelcapitao

mantle/cmd/kola/testiso.go

@@ -245,7 +245,7 @@ Before=coreos-test-installer.service
 [Service]
 Type=oneshot
 RemainAfterExit=yes
-ExecStart=/bin/bash -c '[[ $(findmnt -nvro SOURCE /sysroot) == /dev/mapper/mpatha4 ]]'
+ExecStart=/bin/bash -c 'lsblk -pno NAME "/dev/mapper/$(multipath -l -v 1)" | grep -qw "$(findmnt -nvr /sysroot -o SOURCE)"'
 [Install]
 RequiredBy=multi-user.target`