Make sure RTF_LOCAL route entries are UP when added to the tree.

Make sure RTF_LOCAL route entries are UP when added to the tree.

This is required to maintain the original BSD behavior of locally
configured addresses being always reacheable.

Some interfaces are^w^W^Wem(4) is special and generally has a DOWN
link state when configured by netstart(8).  As a result all the
route entries cloned/added before its link state goes to UP are also
marked as DOWN.

Note that this problem was not present when local addresses were
attached to lo0.

ok mikeb@