common/config: Make test and scratch devices use the same mount options

common/config: Make test and scratch devices use the same mount options

Some cases(e.g. generic/519) check commands/features on test device but
do tests on scratch device.  If some mount options can impact the check
result, these cases may throw error instead if not run when we use
different mount options for test and scratch devices.

Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>