ip: SVR fix race condition

ip: SVR fix race condition

There could be a race condition where two fragments of one chain end up
at the same time on different workers, one overwriting others hash
entry. Add a check for that and restart processing on the unlucky worker
who ends up being second from hash table POV. This will then result in a
proper handover to worker now owning this reassembly.

Type: fix
Fixes: de34c35fc73226943538149fae9dbc5cfbdc6e75
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Change-Id: I9eb29c5cb1ffe3b5eb1d5a638e17ab7ba2628d28