Revision 332400

MFC r331668:
  Rework ipfw rules parsing and printing code.

  Introduce show_state structure to keep information about printed opcodes.
  Split show_static_rule() function into several smaller functions. Make
  parsing and printing opcodes into several passes. Each printed opcode
  is marked in show_state structure and will be skipped in next passes.
  Now show_static_rule() function is simple, it just prints each part
  of rule separately: action, modifiers, proto, src and dst addresses,
  options. The main goal of this change is avoiding occurrence of wrong
  result of `ifpw show` command, that can not be parsed by ipfw(8).
  Also now it is possible to make some simple static optimizations
  by reordering of opcodes in the rule.

  PR:		222705