zdtm: ipc_namespace: Bound min/max for mqueue/msg_max

Otherwise
 | 11:03:13.524: 19446: ERR: ipc_namespace.c:212: Can't write 0 into /proc/sys/fs/mqueue/msg_max (errno = 22 (Invalid argument))
 | 11:03:13.524: 19446: ERR: ipc_namespace.c:273: Failed to randomize ipc namespace tunables (errno = 22 (Invalid argument))
 | 11:03:13.524: 19446: ERR: ipc_namespace.c:336: Failed to randomize ipc ns before migration (errno = 22 (Invalid argument))
 | 11:03:13.527: 19445: ERR: test.c:298: Test exited with unexpectedly with code 1 (errno = 4 (Interrupted system call))

https://bugzilla.openvz.org/show_bug.cgi?id=2530



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