Push locking down to icmp_sysctl().HEADmastercvs/HEAD

Keep locking only for ICMPCTL_REDIRTIMEOUT case. It is complicated, so
left it as is.

ICMPCTL_STATS loads per-CPU counters into local data, so no locking
required.

`icmpctl_vars' are atomically accessed integers. Except `icmperrppslim'
they are simply booleans, so nothing special required. Used the local
`icmperrppslim_local' variable to load `icmperrppslim' value because it
it could have negative values. claudio@ proposed to always load such
values to local variables, so I want to try this notation.

ok bluhm

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