zdtm: maps05 -- Test a flood of small VMAs

Here we test a big number of small VMAs to survive c/r. The main
idea is to use a big number of IOVs needed for page transferring.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>