[Libvirt-cim] [PATCH] [TEST] Fix test domain creation when ".vmlinuz-*.hmac" exist under /boot

When files with name like ".vmlinuz-*.hmac" exist under /boot, function "kernel_path" in "xmt-makefv.sh" will return unreasonable value. And it makes the test domain creation failed. Updates: - modified function "kernel_path" in "xmt-makefv.sh" Signed-off-by: Osier Yang <jyang@redhat.com>