[ospfd] Add passive-interface default support

2006-10-22 Yar Tikhiy <yar@comp.chem.msu.su>

	* (general) Add support for passive-interface default (with
	  minor edits by Paul Jakma).
	* ospf_interface.h: Add OSPF_IF_PASSIVE_STATUS macro, looking
	  at configured value, or the global 'default' value, as
	  required.
	* ospf_interface.c: (ospf_if_new_hook) Leave passive
	  unconfigured per default, allowing global 'default' to
	  take effect for unconfigured interfaces.
	* ospf_packet.c: (various) use OSPF_IF_PASSIVE_STATUS
	* ospf_vty.c: (ospf_passive_interface_default) new function,
	  unset passive from all interfaces if default is enabled, as
	  the per-iface settings become redundant.
	  (ospf_passive_interface_update) new func, update passive
	  setting taking global default into account.
	  ({no,}ospf_passive_interface_addr_cmd) Add support for
	  'default' variant of command.
	  (show_ip_ospf_interface_sub) Update to take global
	  default into account when printing passive status.
	  (ospf_config_write) ditto.
	* ospfd.c: (ospf_new) set global passive-interface default.
	* ospfd.h: (struct ospf) Add field for global
          passive-interface.

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