LU-14546 tests: set smbpasswd correctly

LU-14546 tests: set smbpasswd correctly

For RHEL 8.2 the smbpasswd tool requires password
confirmation.

Test-Parameters: trivial
Signed-off-by: Elena Gryaznova <elena.gryaznova@hpe.com>
HPE-bug-id: LUS-9761
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Change-Id: I367fca4253f1b06dae220921106d321e52d10bc7
Reviewed-on: https://review.whamcloud.com/42132
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>