kernel - PF SMP work - fix RDR rules
* Use the global state table for all global-flagged state. RDR
rules can apparently cause PF_SK_WIRE/PF_SK_STACK to be
reversed so our global state table tests which only used
PF_SK_WIRE for GLOBAL-flagged translations were not sufficient.
* Fixes issues with the reverse packet direction for a rdr
rule not finding the reverse state.
* Note that RDR rules will not be SMP-optimal.
* Adds a bit more overhead for NAT translations which are not
SMP optimal (however, most NAT translations select a port
that will be SMP optimal).
Reported-by: alexh