add support for mapping route labels to AS-external route tags.

manpage bits from jmc@
ok norby@ claudio@

Now that rtlabels are accessable via sysctl we can use route lables to
define which routes should be redistributed via OSPF. So now you can
define the export list on a fine graded basis. More to come

Now that rtlabels are accessable via sysctl we can use route lables to
define which routes should be redistributed via OSPF. So now you can
define the export list on a fine graded basis. More to come... OK norby@

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