zebra, lib: upon lsp install, iterate nexthop accordingly

There are two ways of iterating over nexthops of a given
route entry.
- Either only the main nexthop are taken into account
(which is the case today when attempting to install an
LSP entry on a BGP connected labeled route.
- Or by taking into account nexthops that are resolved
and linked in nexthop->resolved of the previous nexthop
which has RECURSIVE flag set. This second case has to be
taken into account in the case where recursive routes may
be used to install an LSP entry.

Introduce a new API in nexthop that will parse over the
appropriate nexthop, if the nexthop-resolution flag is turned
on or not on the given VRF.

Use that API in the lsp_install() function so as to walk
over the appropriate nexthops.

Co-developed-by: Dmytro Shytyi <dmytro.shytyi@6wind.com>
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
Signed-off-by: Dmytro Shytyi <dmytro.shytyi@6wind.com>

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