pf: use an enum for packet direction in divert tag

pf: use an enum for packet direction in divert tag

The benefit is that in the debugger you will see PF_DIVERT_MTAG_DIR_IN
instead of 1 when looking at a structure. And compilation time failure
if anybody sets it to a wrong value. Using "port" instead of "ndir" when
assigning a port improves readability of code.

Suggested by:	glebius
MFC after:	3 weeks
X-MFC-With:	fabf705f4b