Change terminology of port behavior from "reset, block" to "closed, filtered"

- Better matches with nmap's output and standard terminology
Additional changes to port terminology update
Fix old call to dhcp_getconf (now queued) in parse.y
Don't ICMP respond when set to 'closed' (was only if filtered)
Regenerate the lex and yacc files lex.c and parse.c/parse.h
Merge remote-tracking branch 'origin/port_terminology' into integration