CIDR/INET structure member renaming

Applied patch:

Use 'is_cidr' in INET/CIDR structure, rather than the generic 'type'

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073