{local|remote}.ip for PROXY support, we do not want to waste 16 bytes
extra on pointers, so put all the {client|server|local|remote}.ip into
a single array -- which is unfortunately complicated by the opaqueness
of struct vsa.

With 8 byte pointers, having a char[X] for X <= 8 is cheaper than
than a char *.

Don't waste 32bits on the overflow flag.

accept-filters

This saves approx 50 bytes of storage for the session structure
and puts us comfortably below 256 bytes, at least i the IPv4 case.

Spotted by: c0004x.vtc on slow machines.

Suggested by:	scoof