ip: reassembly - fix missing ip6 owner thread init

Initialize ip6 memory owner thread index in reassembly context to avoid
unnecessary handovers.

Type: fix
Fixes: 630ab5846b
Signed-off-by: Klement Sekera <ksekera@cisco.com>
Change-Id: I2996caf1f82a0649c97d481b74dce24a96dce326

src/vnet/ip/reass/ip6_full_reass.c

@@ -556,6 +556,7 @@ again:
       reass->data_len = 0;
       reass->next_index = ~0;
       reass->error_next_index = ~0;
+      reass->memory_owner_thread_index = vm->thread_index;
       ++rt->reass_n;
     }