test/secure: don't use the shell_job option

It's required to execute the test in Jenkins.

Signed-off-by: Andrew Vagin <avagin@openvz.org>
Acked-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>