Changes

net/sysctl: put common multiplier outside the brackets

Also add an explanation of the logic behind this calculation.

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
 (commit: 7f35e46)

net/sysctl: c/r ipv4/ping_group_range value

It is per net namespace, we need it to allow creation of unprivileged
ICMP sockets.

Note: in case this sysctl was disabled after unprivileged ICMP
socket was created we still need to somehow handle it on restore.

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
 (commit: f38e588)

zdtm/netns_sub_sysctl: add ipv4/ping_group_range sysctl check

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
 (commit: 1c9fd58)